{"id":"CVE-2026-67314","aliases":["GHSA-xj6q-8x83-jv6g"],"url":"https://o3.security/vulnerability/CVE-2026-67314","summary":"axios before 1.18.0 Prototype Pollution via auth subfields","details":"axios versions >=1.15.2 and <1.18.0 contain prototype-pollution read-side gadgets in Basic auth subfield handling (lib/adapters/http.js and lib/helpers/resolveConfig.js). When an application is already affected by a separate prototype-pollution primitive and makes an axios request with an own auth object that omits the username and/or password properties, axios reads the inherited Object.prototype.username and Object.prototype.password values and uses them to construct an outbound 'Authorization: Basic ...' header. axios itself does not pollute prototypes. The practical impact is outbound request tampering: an attacker who controls the polluted prototype values can inject attacker-chosen Basic auth credentials or replace an existing Authorization header. Credential disclosure is only possible under additional application-specific conditions.","published":"2026-08-01T12:22:16.603Z","modified":"2026-08-12T03:51:09.386437839Z","cvss":null,"epss":{"score":0.00366,"percentile":0.29247,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"axios","fixedVersion":"1.18.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67314.json"},{"type":"ADVISORY","url":"https://github.com/axios/axios/security/advisories/GHSA-xj6q-8x83-jv6g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67314"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/axios-before-prototype-pollution-via-auth-subfields"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:09.386437839Z"}}