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CVE-2026-31830— sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest

Quick assessment

Affected
sigstore sigstore-ruby
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Sigstore是sigstore开源的一个软件签名验证库。 Sigstore 0.2.3之前版本存在安全漏洞，该漏洞源于验证过程中未正确传播验证失败信息，可能导致验证绕过。

CVSS 7.5 · High EPSS 0.42% · P35
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I. Basic Information for CVE-2026-31830

Vulnerability Information
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Vulnerability Title
sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest
Source: CVE Program / CVE List V5
Vulnerability Description
sigstore-ruby is a pure Ruby implementation of the sigstore verify command from the sigstore/cosign project. Prior to 0.2.3, Sigstore::Verifier#verify does not propagate the VerificationFailure returned by verify_in_toto when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns VerificationSuccess regardless of whether the artifact matches the attested subject. This vulnerability is fixed in 0.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
Sigstore 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Sigstore是sigstore开源的一个软件签名验证库。 Sigstore 0.2.3之前版本存在安全漏洞，该漏洞源于验证过程中未正确传播验证失败信息，可能导致验证绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sigstore sigstore-ruby < 0.2.3 -

II. Public POCs for CVE-2026-31830

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III. Intelligence Information for CVE-2026-31830

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Vendor Advisories for CVE-2026-31830 (1)

IV. Related Vulnerabilities

Same vendor: sigstore
Same weakness: CWE-252

V. Comments for CVE-2026-31830

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