CVE-2026-24408 | BDVDB-2026-312477 Detail

sigstoresigstore-python

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

CWE-352 Cross-Site Request Forgery (CSRF)

References#

Exploit#

No public exploit known

History#

Version 12026-01-26Record published in the CVE List.
Version 22026-01-27Most recent update recorded in the CVE List.

Published

Published: 2026-01-26
Last modified: 2026-01-27

Vendor information

Vendor: sigstore
Product: sigstore-python

All sigstore vulnerabilities

Score

0.0 None

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 7.4.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Request Forgery

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 4.2.0
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

0.0 None

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

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).