How severe is CVE-2026-24408?

CVE-2026-24408 has a CVSS 3.x base score of 0.0, rated none severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability none.

Is CVE-2026-24408 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24408?

CVE-2026-24408 affects Linuxfoundation Sigstore-python. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24408?

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

Does CVE-2026-24408 have an EU (EUVD) identifier?

Yes. CVE-2026-24408 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4729.

When was CVE-2026-24408 published?

CVE-2026-24408 was published on 2026-01-26 and last updated on 2026-06-17.

CVE-2026-24408

CVE-2026-24408 is a none-severity vulnerability in Linuxfoundation Sigstore-python with a CVSS 3.x base score of 0.0. 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-352.

Key facts

Severity: None (CVSS 3.x base score 0.0)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4729
Weakness: CWE-352
Affected product: Linuxfoundation Sigstore-python
Published: 2026-01-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-24408?: 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.
How severe is CVE-2026-24408?: CVE-2026-24408 has a CVSS 3.x base score of 0.0, rated none severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability none.
Is CVE-2026-24408 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24408?: CVE-2026-24408 affects Linuxfoundation Sigstore-python. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24408?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-24408 have an EU (EUVD) identifier?: Yes. CVE-2026-24408 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4729.
When was CVE-2026-24408 published?: CVE-2026-24408 was published on 2026-01-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:linuxfoundation:sigstore-python:*:*:*:*:*:*:*:*

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