Axios v1.15.1

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