CVE-2026-24408

low-risk
Published 2026-01-26

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.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance

Affected Products (1)

Sigstore-Python

Affected Vendors

Linuxfoundation

References (3)

Patch https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074e...
Product https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0
Vendor Advisory https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w...
8
/ 100
low-risk
Severity 3/34 · Minimal
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal