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    <lastBuildDate>Wed, 07 Oct 2026 21:18:14 +0000</lastBuildDate>
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      <title>CVE-2026-31830 — sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-31830</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; sigstore-ruby&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; sigstore-ruby&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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