PT-2026-51407 · Cap Go · Cap-Go

Judel777 · Published 2026-06-22 · Updated 2026-06-22 · CVE-2026-56306

Mitre

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

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.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-56306

Affected Products

Cap-Go

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-56306 · Security Note
• https://github.com/Cap-go/capgo/security/advisories/GHSA-42vv-8j94-24wj · Vendor Advisory
• https://vulncheck.com/advisories/capgo-subkey-enforcement-bypass-via-x-limited-key-id-header-parsing · Note