{"cve":"CVE-2026-101908","nvd":{"published":"2026-09-28T18:17:19.440","modified":"2026-09-30T19:38:27.293","status":"Undergoing Analysis","description":"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.","cvss_v4":{"vector":"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","score":6.9},"cvss_v3":null,"cwes":["CWE-1321"],"references":["https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a","https://github.com/axios/axios/pull/11141","https://github.com/axios/axios/releases/tag/v1.20.0","https://github.com/axios/axios/security/advisories/GHSA-vh66-26gq-q6x8","https://github.com/axios/axios/security/advisories/GHSA-vh66-26gq-q6x8"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:48.555445741+00:00"},"epss":{"cve":"CVE-2026-101908","score":0.00471,"percentile":0.40432,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-vh66-26gq-q6x8","url":"https://osv.dev/vulnerability/GHSA-vh66-26gq-q6x8","summary":"Axios: Prototype pollution gadget in fetch adapter can alter outbound requests","modified":"2026-09-30T15:30:04.438497820Z","packages":[{"ecosystem":"npm","name":"axios","purl":"pkg:npm/axios","ranges":[">=1.7.0 <1.20.0"],"fixed":["1.20.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}