CVE-2026-56306
Capgo before 12.128.2 contains a weak parsing vulnerability in the x-limited-key-id header that allows attackers to bypass subkey enforcement by submitting malformed values, zero, or duplicate headers that result in NaN or falsy values. Remote attackers can manipulate the x-limited-key-id header to disable limited key scoping and execute requests using the main API key context instead of restricted subkey permissions.
- Score
- CVSS 3.1 6.4 Medium
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-06-22
- Last modified
- 2026-10-25
- Weaknesses
- CWE-20
Affected products
References
- https://github.com/Cap-go/capgo/security/advisories/GHSA-42vv-8j94-24wj
- https://www.vulncheck.com/advisories/capgo-subkey-enforcement-bypass-via-x-limited-key-id-header-parsing
