This release ships a coordinated set of security hardening fixes across headers, body/redirect limits, multipart handling, and XSRF/prototype-pollution vectors, alongside a broad sweep of bug fixes, test migrations, and threat-model documentation updates.

🔒 Security Fixes

• Header Injection Hardening: Tightened validation and sanitisation across request header construction to close the header-injection attack surface. (#10749)
• CRLF Stripping in Multipart Headers: Correctly strips CR/LF from multipart header values to prevent injection via field names and filenames. (#10758)
• Prototype Pollution / Auth Bypass: Replaced unsafe in checks with hasOwnProperty to prevent authentication bypass via prototype pollution on config objects, with additional regression tests. (#10761, #10760)
• withXSRFToken Truthy Bypass: Short-circuits on any truthy non-boolean value, so an ambiguous config no longer silently leaks the XSRF token cross-origin. (#10762)
• maxBodyLength With Zero Redirects: Enforces maxBodyLength even when maxRedirects is set to 0, closing a bypass path for oversized request bodies. (#10753)
• Streamed Response maxContentLength Bypass: Applies maxContentLength to streamed responses that previously bypassed the cap. (#10754)
• Follow-up CVE Completion: Completes an earlier incomplete CVE fix to fully close the regression window. (#10755)

🚀 New Features

• AI-Based Docs Translations: Initial scaffold for AI-assisted translations of the documentation site. (#10705)
• Location Request Header Type: Adds Location to CommonRequestHeadersList for accurate typing of redirect-aware requests. (#7528)

🐛 Bug Fixes

• FormData Handling: Removes Content-Type when no boundary is present on FormData fetch requests, supports multi-select fields, cancels request.body instead of the source stream on fetch abort, and fixes a recursion bug in form-data serialisation. (#7314, #10676, #10702, #10726)
• HTTP Adapter: Handles socket-only request errors without leaking keep-alive listeners. (#10576)
• Progress Events: Clamps loaded to total for computable upload/download progress events. (#7458)
• Types: Aligns runWhen type with the runtime behaviour in InterceptorManager and makes response header keys case-insensitive. (#7529, #10677)
• buildFullPath: Uses strict equality in the base/relative URL check. (#7252)
• AxiosURLSearchParams Regex: Improves the regex used for param serialisation to avoid edge-case mismatches. (#10736)
• Resilient Value Parsing: Parses out header/config values instead of throwing on malformed input. (#10687)
• Docs Artefact Cleanup: Removes the docs content that was incorrectly committed. (#10727)

🔧 Maintenance & Chores

• Threat Model & Security Docs: Ongoing refinement of THREATMODEL.md, including Hopper security update, TLS and tag-replay wording, mitigation descriptions, decompression-bomb guidance, and further cleanup. (#10672, #10715, #10718, #10722, #10763, #10765)
• Test Coverage & Migration: Expanded shouldBypassProxy coverage for wildcard/IPv6/edge cases, documented and tested AxiosError.status, and migrated progressEventReducer tests to Vitest. (#10723, #10725, #10741)
• Type Refactor: Uses TypeScript utility types to deduplicate literal unions. (#7520)
• Repo & CI: Adds CODEOWNERS, switches v1.x releases to an ephemeral release branch, and removes orphaned Bower support. (#10739, #10738, #10746)
• Changelog Backfill: Added missing version entries to the changelog. (#10704)
• Dependencies: Bumped follow-redirects (1.15.11 → 1.16.0) in root and docs, axios (1.14.0 → 1.15.0) in docs, and a group of 5 development dependencies. (#10717, #10716, #10684, #10709)

🌟 New Contributors

We are thrilled to welcome our new contributors. Thank you for helping improve axios:

• @curiouscoder-cmd (#7252)
• @tryonelove (#7520)
• @darwin808 (#7314)
• @zoontek (#10702)
• @AKIB473 (#10725)

Full Changelog

This release backports a broad set of security hardenings from the v1 line — covering prototype-pollution defences, stream size enforcement, XSRF handling, URL null-byte encoding, and bounded FormData recursion — and drops committed dist/ artefacts along with Bower support.

⚠️ Breaking Changes & Deprecations

• Bower & Committed dist/ Removed: dist/ bundles are no longer committed to the repo, and bower.json plus the Grunt package2bower task have been removed. CI still builds bundles before publish, so npm/yarn/pnpm consumers are unaffected; installs via Bower or directly from the git tree must migrate to npm or a CDN. (#10747)

🔒 Security Fixes

• Prototype Pollution in Header Merge (GHSA-6chq-wfr3-2hj9): Tightened isFormData to reject plain/null-prototype objects and require append, and guarded the Node HTTP adapter so data.getHeaders() is only merged when it is not inherited from Object.prototype. Blocks injected headers via polluted getHeaders. (#10750)
• Prototype Pollution in Config Merging (GHSA-pf86-5x62-jrwf): mergeConfig, defaults resolution, and the HTTP adapter now uses own-property checks for transport, env, Blob, formSerializer, and transforms arrays, and merged configs are returned as null-prototype objects. Prevents hijacking of the request flow through polluted prototypes. (#10752)
• FormData / Params Recursion DoS: Added a configurable maxDepth (default 100, Infinity disables) to toFormData and params serialisation, throwing AxiosError with code ERR_FORM_DATA_DEPTH_EXCEEDED when exceeded. Circular-reference detection is preserved. (#10728)
• Null-Byte Injection in Query Strings: Removed the unsafe %00 → null-byte substitution from AxiosURLSearchParams.encode so %00 is preserved as-is. Other encoding behaviour (including %20 → +) unchanged. (#10737)
• Consolidated v1 Security Backport: Rolls up remaining v1 hardenings into v0.x: maxContentLength enforcement for responseType: 'stream' via a guarded transform with deferred piping, maxBodyLength enforcement for streamed uploads on native http/https with maxRedirects: 0, and stricter withXSRFToken handling so only own boolean true enables cross-origin XSRF headers. (#10764)

🔧 Maintenance & Chores

• CODEOWNERS: Added .github/CODEOWNERS with * @jasonsaayman to set a default reviewer for all paths. (#10740)

Full Changelog

This release backports security fixes from v1.x, hardens the CI/CD supply chain with OIDC publishing and zizmor scanning, resolves TypeScript typing issues in AxiosInstance, and fixes a performance regression in isEmptyObject().

🔒 Security Fixes

• Header Injection & Proxy Bypass: Backports v1 security hardening — sanitizes outgoing header values to strip invalid bytes, CRLF sequences, and boundary whitespace (including array values); adds proper NO_PROXY/no_proxy enforcement covering wildcards, explicit ports, loopback aliases (localhost, 127.0.0.1, ::1), bracketed IPv6, and trailing-dot hostnames. Proxy bypass is now checked before the proxy URL is parsed, and parsed.host is used for correct port and IPv6 handling. (#10688)

• CI Security: SHA-pins all actions and disables credential persistence in v0.x CI, introduces zizmor security scanning with SARIF upload to code scanning, adds an OIDC Trusted Publishing workflow with npm provenance attestations, and gates all publishes behind a required npm-publish GitHub Environment with configurable reviewer protections. (#10638, #10639, #10667)

🐛 Bug Fixes

• TypeScript — AxiosInstance Return Types: Fixes return types in AxiosInstance methods to correctly resolve to Promise<R> (matching AxiosPromise<T> semantics), and corrects the generic call signature so TypeScript properly enforces the response data type. TypeScript-only changes; no runtime impact. (#6253, #7328)

• Performance: Fixes a performance regression in isEmptyObject() that caused excessive computation when the argument was a large string. (#6484)

🔧 Maintenance & Chores

• Versioning & CI Workflow: Adds an automated versioning flow for v0.x, renames the CI workflow for consistency with the v1.x naming convention, and corrects the branch name reference in CI config. (#10690, #10691, #10692)

🌟 New Contributors

We are thrilled to welcome our new contributors. Thank you for helping improve axios:

• @nakataki17 (#6253)
• @gmasclet (#6484)
• @shaanmajid (#10638, #10639, #10667)
• @ivan-churakov (#7328)

Full Changelog

This release delivers two critical security patches, adds runtime support for Deno and Bun, and includes significant CI hardening, documentation improvements, and routine dependency updates.

⚠️ Important Changes

• Deprecation: url.parse() usage has been replaced to address Node.js deprecation warnings. If you are on a recent version of Node.js, this resolves console warnings you may have been seeing. (#10625)

🔒 Security Fixes

• Proxy Handling: Fixed a no_proxy hostname normalisation bypass that could lead to Server-Side Request Forgery (SSRF). (#10661)
• Header Injection: Fixed an unrestricted cloud metadata exfiltration vulnerability via a header injection chain. (#10660)

🚀 New Features

• Runtime Support: Added compatibility checks and documentation for Deno and Bun environments. (#10652, #10653)

🔧 Maintenance & Chores

• CI Security: Hardened workflow permissions to least privilege, added the zizmor security scanner, pinned action versions, and gated npm publishing with OIDC and environment protection. (#10618, #10619, #10627, #10637, #10666)
• Dependencies: Bumped serialize-javascript, handlebars, picomatch, vite, and denoland/setup-deno to latest versions. Added a 7-day Dependabot cooldown period. (#10574, #10572, #10568, #10663, #10664, #10665, #10669, #10670, #10616)
• Documentation: Unified docs, improved beforeRedirect credential leakage example, clarified withCredentials/withXSRFToken behaviour, HTTP/2 support notes, async/await timeout error handling, header case preservation, and various typo fixes. (#10649, #10624, #7452, #7471, #10654, #10644, #10589)
• Housekeeping: Removed stale files, regenerated lockfile, and updated sponsor scripts and blocks. (#10584, #10650, #10582, #10640, #10659, #10668)
• Tests: Added regression coverage for urlencoded Content-Type casing. (#10573)

🌟 New Contributors

We are thrilled to welcome our new contributors. Thank you for helping improve Axios:

• @raashish1601 (#10573)
• @Kilros0817 (#10625)
• @ashstrc (#10624)
• @Abhi3975 (#10589)
• @theamodhshetty (#7452)

This release focuses on compatibility fixes, adapter stability improvements, and test/tooling modernisation.

⚠️ Important Changes

• Breaking Changes: None identified in this release.
• Action Required: If you rely on env-based proxy behaviour or CJS resolution edge-cases, validate your integration after upgrade (notably proxy-from-env v2 alignment and main entry compatibility fix).

🚀 New Features

• Runtime Features: No new end-user features were introduced in this release.
• Test Coverage Expansion: Added broader smoke/module test coverage for CJS and ESM package usage. (#7510)

🐛 Bug Fixes

• Headers: Trim trailing CRLF in normalised header values. (#7456)
• HTTP/2: Close detached HTTP/2 sessions on timeout to avoid lingering sessions. (#7457)
• Fetch Adapter: Cancel ReadableStream created during request-stream capability probing to prevent async resource leaks. (#7515)
• Proxy Handling: Fixed env proxy behavior with proxy-from-env v2 usage. (#7499)
• CommonJS Compatibility: Fixed package main entry regression affecting CJS consumers. (#7532)

🔧 Maintenance & Chores

• Security/Dependencies: Updated formidable and refreshed package set to newer versions. (#7533, #10556)
• Tooling: Continued migration to Vitest and modernised CI/test harnesses. (#7484, #7489, #7498)
• Build/Lint Stack: Rollup, ESLint, TypeScript, and related dev-dependency updates. (#7508, #7509, #7522)
• Documentation: Clarified JSON parsing and adapter-related docs/comments. (#7398, #7460, #7478)

🌟 New Contributors

We are thrilled to welcome our new contributors. Thank you for helping improve Axios:

• @aviu16 (#7456)
• @NETIZEN-11 (#7460)
• @fedotov (#7457)
• @nthbotast (#7478)
• @veeceey (#7398)
• @penkzhou (#7515)

Full Changelog: v1.13.6...v1.14.0

This release focuses on platform compatibility, error handling improvements, and code quality maintenance.

⚠️ Important Changes

• Breaking Changes: None identified in this release.
• Action Required: Users targeting React Native should verify their integration, particularly if relying on specific Blob or FormData behaviours, as improvements have been made to support these objects.

🚀 New Features

• React Native Blob Support: Axios now includes support for React Native Blob objects. Thanks to @moh3n9595 for the initial implementation. (#5764)
• Code Quality: Implemented prettier across the codebase and resolved associated formatting issues. (#7385)

🐛 Bug Fixes

• Environment Compatibility:

  • Fixed module exports for React Native and Browserify environments. (#7386)
  • Added safe FormData detection for the WeChat Mini Program environment. (#7324)

• Error Handling:

  • AxiosError.message is now correctly enumerable. (#7392)
  • AxiosError.from now correctly copies the status property from the source error, ensuring better error propagation. (#7403)

🔧 Maintenance & Chores

• Dependencies: Updated the development_dependencies group (5 updates). (#7432)
• Infrastructure: Migrated @rollup/plugin-babel from v5.3.1 to v6.1.0. (#7424)
• Documentation: Added missing JSDoc comments to utilities. (#7427)

🌟 New Contributors

We are thrilled to welcome our new contributors! Thank you for helping improve the project:

• @Gudahtt (#7386)
• @ybbus (#7392)
• @Shiwaangee (#7324)
• @skrtheboss (#7403)
• @Janaka66 (#7427)
• @moh3n9595 (#5764)
• @digital-wizard48 (#7424)

Full Changelog: v1.13.5...v1.13.6

This is a critical security maintenance release for the v0.x branch. It addresses a high-priority vulnerability involving prototype pollution that could lead to a Denial of Service (DoS).

Recommendation: All users currently on the 0.x release line should upgrade to this version immediately to ensure environment stability.

🛡️ Security Fixes

• Backport: Fix DoS via proto key in merge config
  • Patched a vulnerability where specifically crafted configuration objects using the proto key could cause a Denial of Service during the merge process. - by @FeBe95 in PR #7388

⚙️ Maintenance & CI

• CI Infrastructure Update
  • Updated Continuous Integration workflows for the v0.x branch to maintain long-term support and build reliability. - by @jasonsaayman in PR #7407

⚠️ Breaking Changes

Configuration Merging Behavior:

As part of the security fix, Axios now restricts the merging of the proto key within configuration objects. If your codebase relies on unconventional deep-merging patterns that target the object prototype via Axios config, those operations will now be blocked. This is a necessary change to prevent prototype pollution.

Full Changelog: v0.30.2...v0.30.3

Release 1.13.5

Highlights

• Security: Fixed a potential Denial of Service issue involving the __proto__ key in mergeConfig. (PR #7369)
• Bug fix: Resolved an issue where AxiosError could be missing the status field on and after v1.13.3. (PR #7368)

Changes

Security

• Fix Denial of Service via __proto__ key in mergeConfig. (PR #7369)

Fixes

• Fix/5657. (PR #7313)
• Ensure status is present in AxiosError on and after v1.13.3. (PR #7368)

Features / Improvements

• Add input validation to isAbsoluteURL. (PR #7326)
• Refactor: bump minor package versions. (PR #7356)

Documentation

• Clarify object-check comment. (PR #7323)
• Fix deprecated Buffer constructor usage and README formatting. (PR #7371)

CI / Maintenance

• Chore: fix issues with YAML. (PR #7355)
• CI: update workflow YAMLs. (PR #7372)
• CI: fix run condition. (PR #7373)
• Dev deps: bump karma-sourcemap-loader from 0.3.8 to 0.4.0. (PR #7360)
• Chore(release): prepare release 1.13.5. (PR #7379)

New Contributors

• @sachin11063 (first contribution — PR #7323)
• @asmitha-16 (first contribution — PR #7326)

Full Changelog: v1.13.4...v1.13.5

Overview

The release addresses issues discovered in v1.13.3 and includes significant CI/CD improvements.

Full Changelog: v1.13.3...v1.13.4

What's New in v1.13.4

Bug Fixes

• fix: issues with version 1.13.3 (#7352) (ee90dfc)
  • Fixed issues discovered in v1.13.3 release
  • Cleaned up interceptor test files
  • Improved workflow configurations

Infrastructure & CI/CD

• refactor: ci and build (#7340) (8ff6c19)

  • Major refactoring of CI/CD workflows
  • Consolidated workflow files for better maintainability
  • Added mise configuration for the development environment
  • Improved sponsor block update automation
  • Enhanced issue and PR templates
  • Added automatic release notes generation
  • Implemented workflow cancellation for concurrent runs

• chore: codegen and some updates to workflows (76cf77b)

  • Code generation improvements
  • Workflow optimisations

Migration Notes

Breaking Changes

None in this release.

Deprecations

None in this release.

Contributors

Thank you to all contributors who made this release possible! Special thanks to:

• jasonsaayman - Release management and CI/CD improvements

Release notes:

Bug Fixes

• http2: Use port 443 for HTTPS connections by default. (#7256) (d7e6065)
• interceptor: handle the error in the same interceptor (#6269) (5945e40)
• main field in package.json should correspond to cjs artifacts (#5756) (7373fbf)
• package.json: add 'bun' package.json 'exports' condition. Load the Node.js build in Bun instead of the browser build (#5754) (b89217e)
• silentJSONParsing=false should throw on invalid JSON (#7253) (#7257) (7d19335)
• turn AxiosError into a native error (#5394) (#5558) (1c6a86d)
• types: add handlers to AxiosInterceptorManager interface (#5551) (8d1271b)
• types: restore AxiosError.cause type from unknown to Error (#7327) (d8233d9)
• unclear error message is thrown when specifying an empty proxy authorization (#6314) (6ef867e)

Features

• add undefined as a value in AxiosRequestConfig (#5560) (095033c)
• add automatic minor and patch upgrades to dependabot (#6053) (65a7584)
• add Node.js coverage script using c8 (closes #7289) (#7294) (ec9d94e)
• added copilot instructions (3f83143)
• compatibility with frozen prototypes (#6265) (860e033)
• enhance pipeFileToResponse with error handling (#7169) (88d7884)
• types: Intellisense for string literals in a widened union (#6134) (f73474d), closes /github.com/microsoft/TypeScript/issues/33471#issuecomment-1376364329

Reverts

• Revert "fix: silentJSONParsing=false should throw on invalid JSON (#7253) (#7…" (#7298) (a4230f5), closes #7253 #7 #7298
• deps: bump peter-evans/create-pull-request from 7 to 8 in the github-actions group (#7334) (2d6ad5e)

Contributors to this release

• Ashvin Tiwari
• Nikunj Mochi
• Anchal Singh
• jasonsaayman
• Julian Dax
• Akash Dhar Dubey
• Madhumita
• Tackoil
• Justin Dhillon
• Rudransh
• WuMingDao
• codenomnom
• Nandan Acharya
• Eric Dubé
• Tibor Pilz
• Gabriel Quaresma
• Turadg Aleahmad
• JohnTitor
• rohit miryala
• Wilson Mun
• techcodie
• Ved Vadnere
• svihpinc
• SANDESH LENDVE
• Lubos
• Jarred Sumner
• Adam Hines
• Subhan Kumar Rai
• Joseph Frazier
• KT0803
• Albie
• Jake Hayes