CVE-2026-101900
The inherited getHeaders function can return attacker-controlled headers that resolveConfig merges into a fetch adapter request.
Does this matter?
Lower severity and a low EPSS score (0.55%). Track it; it rarely justifies an emergency change on its own.
Description
Axios is a promise-based HTTP client for the browser and Node.js. From 1.12.0 until 1.20.0, ResolveConfig reads inherited Symbol.toStringTag, append, and getHeaders properties while resolving FormData headers. A separate same-process prototype-pollution flaw supplies an array or non-plain class instance whose inherited properties make it appear FormData-like; plain objects are blocked. The inherited getHeaders function can return attacker-controlled headers that resolveConfig merges into a fetch adapter request. Attacker-controlled headers can alter authorization, cache, metadata-service, or application-specific request behavior. This issue is fixed in version 1.20.0.
- CVSS 4.0
- 6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.55% probability · 46th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-74, CWE-693, CWE-1321
- Source
- security-advisories@github.com
EPSS moved from 0.5% on 29 September 2026 to 0.5% on 26 October 2026.
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-4hqw-qxg8-jxx2
- https://github.com/axios/axios/security/advisories/GHSA-4hqw-qxg8-jxx2
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.