How severe is CVE-2026-24122?

CVE-2026-24122 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-24122 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24122?

CVE-2026-24122 affects Sigstore Cosign. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24122?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-24122 have an EU (EUVD) identifier?

Yes. CVE-2026-24122 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8430.

When was CVE-2026-24122 published?

CVE-2026-24122 was published on 2026-02-19 and last updated on 2026-06-17.

CVE-2026-24122

CVE-2026-24122 is a low-severity vulnerability in Sigstore Cosign with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8430
Weakness: CWE-295
Affected product: Sigstore Cosign
Published: 2026-02-19
Last modified: 2026-06-17

Description

Cosign provides code signing and transparency for containers and binaries. In versions 3.0.4 and below, an issuing certificate with a validity that expires before the leaf certificate will be considered valid during verification even if the provided timestamp would mean the issuing certificate should be considered expired. When verifying artifact signatures using a certificate, Cosign first verifies the certificate chain using the leaf certificate's "not before" timestamp and later checks expiry of the leaf certificate using either a signed timestamp provided by the Rekor transparency log or from a timestamp authority, or using the current time. The root and all issuing certificates are assumed to be valid during the leaf certificate's validity. There is no impact to users of the public Sigstore infrastructure. This may affect private deployments with customized PKIs. This issue has been fixed in version 3.0.5.

Frequently asked questions

What is CVE-2026-24122?: Cosign provides code signing and transparency for containers and binaries. In versions 3.0.4 and below, an issuing certificate with a validity that expires before the leaf certificate will be considered valid during verification even if the provided timestamp would mean the issuing certificate should be considered expired. When verifying artifact signatures using a certificate, Cosign first verifies the certificate chain using the leaf certificate's "not before" timestamp and later checks expiry of the leaf certificate using either a signed timestamp provided by the Rekor transparency log or from a timestamp authority, or using the current time. The root and all issuing certificates are assumed to be valid during the leaf certificate's validity. There is no impact to users of the public Sigstore infrastructure. This may affect private deployments with customized PKIs. This issue has been fixed in version 3.0.5.
How severe is CVE-2026-24122?: CVE-2026-24122 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-24122 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24122?: CVE-2026-24122 affects Sigstore Cosign. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24122?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-24122 have an EU (EUVD) identifier?: Yes. CVE-2026-24122 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8430.
When was CVE-2026-24122 published?: CVE-2026-24122 was published on 2026-02-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sigstore:cosign:*:*:*:*:*:*:*:*

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