Outbound Basic auth tampering via inherited subfields
Published Aug 1, 2026 · Updated Aug 1, 2026
Prototype-pollution gadgets in Axios 1.15.2 through 1.17.0 allow remote attackers to tamper with outbound Basic authentication headers. Basic auth handling in lib/adapters/http.js and lib/helpers/resolveConfig.js reads missing username and password subfields through the prototype chain, then encodes inherited values into the Authorization header. Exploitation requires a separate prototype-pollution primitive and an own, empty or partial auth object; the result is attacker-chosen credentials or replacement of an existing header.
Summary
What happened
Prototype-pollution gadgets in Axios 1.15.2 through 1.17.0 allow remote attackers to tamper with outbound Basic authentication headers. Basic auth handling in lib/adapters/http.js and lib/helpers/resolveConfig.js reads missing username and password subfields through the prototype chain, then encodes inherited values into the Authorization header. Exploitation requires a separate prototype-pollution primitive and an own, empty or partial auth object; the result is attacker-chosen credentials or replacement of an existing header.
The record
- CVE
- CVE-2026-67314
- Published
- Aug 1, 2026
- Updated
- Aug 1, 2026
- Vendor
- Axios
- Product
- Axios
- Classifications
- CWE-1321, CAPEC-1, CAPEC-77, CAPEC-180, T1565.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 1, 2026CVE publishedPublication date reported by the CVE source.
- Aug 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.15.2 <1.18.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Axios Basic-auth prototype-pollution proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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