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CVE-2026-24122

17
FAUCET Score

CVE-2026-24122 affects Sigstore Cosign versions 3.0.4 and below, where it incorrectly validates certificate chains by considering an expired issuing certificate as valid if its expiration predates the leaf certificate's validity. This vulnerability has a low CVSS score of 3.7, indicating a network attack vector with high complexity and a low impact on integrity, primarily affecting private deployments with custom PKIs. There is no evidence of active exploitation, public exploit code, or Metasploit/Nuclei modules, though it has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.0.5CPE matchmatch criteria
cpe:2.3:a:sigstore:cosign:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.7LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.20%
Probability of exploitation in next 30 days
EPSS Percentile
9.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0020 is in the 4th percentile among its peer group of 1,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/sigstore/cosignFixed in: 3.0.5

Vendor Advisories (2)

redhatCVE-2026-24122Low

sigstore/cosign: sigstore/cosign: Incorrect signature validation due to expired issuing certificate bypass

Feb 19, 2026
goGHSA-wfqv-66vq-46rmlow

Cosign considered signatures valid with expired intermediate certificates when transparency log verification is skipped

Feb 19, 2026

References

github.com / sigstore/cosign/commit/3c9a7363f563db76d78e2de2cabd945450f3781e
Patch
github.com / sigstore/cosign/releases/tag/v3.0.5
ProductRelease Notes
github.com / sigstore/cosign/security/advisories/GHSA-wfqv-66vq-46rm
ExploitVendor Advisory