{"id":"CVE-2026-101908","summary":"Axios: Prototype pollution gadget in fetch adapter can alter outbound requests","details":"Axios is a promise-based HTTP client for the browser and Node.js. From 1.7.0 until 1.20.0, the fetch adapter constructs a Request with sanitized resolvedOptions but then calls fetch with the original fetchOptions. A separate same-process prototype-pollution flaw populates Object.prototype.headers so fetchOptions.headers resolves through inheritance. The inherited fetchOptions.headers value overrides the sanitized Request headers through the second argument to fetch after Request construction. Attacker-controlled request headers can alter authorization, caching, metadata-service access, or application-specific behavior. This issue is fixed in version 1.20.0.","aliases":["GHSA-vh66-26gq-q6x8"],"modified":"2026-09-30T03:47:03.694903094Z","published":"2026-09-28T17:38:55.303Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-1321"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101908.json"},"references":[{"type":"WEB","url":"https://github.com/axios/axios/releases/tag/v1.20.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101908.json"},{"type":"ADVISORY","url":"https://github.com/axios/axios/security/advisories/GHSA-vh66-26gq-q6x8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101908"},{"type":"FIX","url":"https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a"},{"type":"FIX","url":"https://github.com/axios/axios/pull/11141"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/axios/axios","events":[{"introduced":"3041c61adaaac6d2c43eba28c134e7f4d43ab012"},{"fixed":"d19040bda7a8be2f82c3c6e1a5bc03917daee39a"},{"fixed":"84a9f3b9a4f3244b8c8e818f557d64c7b964fb25"}],"database_specific":{"extracted_events":[{"introduced":"1.7.0"},{"fixed":"1.20.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.19.0","v1.18.1","v1.18.0","v1.17.0","v1.16.1","v1.16.0","v1.15.2","v1.15.1","v1.15.0","v1.14.0","v1.13.6","v1.13.5","v1.13.4","v1.13.3","v1.13.2","v1.13.1","v1.13.0","v1.12.2","v1.12.1","v1.12.0","v1.11.0","v1.10.0","v1.9.0","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.9","v1.7.8","v1.7.7","v1.7.6","v1.7.5","v1.7.4","v1.7.3","v1.7.2","v1.7.1","v1.7.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-101908.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N"}]}