Medium 5.0Published Jan 26, 2026

CVE-2026-24408sigstore-python is a Python tool for generating and verifying Sigstore signatures.

Updated under an hour ago (2026-10-19 09:50 UTC)

Does this affect you?

It affects linuxfoundation sigstore-python. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for linuxfoundation sigstore-python

Exploited in the last 30 days

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.

CVSS: 5.0 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness (CWE): CWE-352
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

linuxfoundation sigstore-python linuxfoundation:sigstore-python	before 4.2.0	NVD

References

https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aapatch
https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0product, release-notes
https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vrvendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.