Vulnerability · Published Jan 26, 2026 · Assigned by GitHub_M
CVE-2026-24408sigstore has CSRF possibility in OIDC authentication during signing
None 0.0
In plain English
A cross-site request forgery in sigstore-python from sigstore. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
sigstore-python is a Python tool for generating and verifying Sigstore signatures. Prior to version 4.2.0, the sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery. `_OAuthSession` creates a unique "state" and sends it as a parameter in the authentication request but the "state" in the server response seems not not be cross-checked with this value. Version 4.2.0 contains a patch for the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | sigstore | 4.2.0 | GHSA-hm8f-75xx-w2vr |
| PyPI | sigstore | 4.2.0 | PYSEC-2026-1924 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| sigstore | sigstore-python | < 4.2.0 |
Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N