Vulnerability Details CVE-2026-49834
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 1.6%
CVSS Severity
CVSS v3 Score 5.9
References
Products affected by CVE-2026-49834
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cpe:2.3:a:sigstore:sigstore-go:-
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cpe:2.3:a:sigstore:sigstore-go:0.1.0
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cpe:2.3:a:sigstore:sigstore-go:0.2.0
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cpe:2.3:a:sigstore:sigstore-go:0.3.0
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cpe:2.3:a:sigstore:sigstore-go:0.4.0
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cpe:2.3:a:sigstore:sigstore-go:0.5.0
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cpe:2.3:a:sigstore:sigstore-go:0.5.1
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cpe:2.3:a:sigstore:sigstore-go:0.6.0
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cpe:2.3:a:sigstore:sigstore-go:0.6.1
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cpe:2.3:a:sigstore:sigstore-go:0.6.2
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cpe:2.3:a:sigstore:sigstore-go:0.7.0
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cpe:2.3:a:sigstore:sigstore-go:0.7.1
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cpe:2.3:a:sigstore:sigstore-go:0.7.2
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cpe:2.3:a:sigstore:sigstore-go:0.7.3
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cpe:2.3:a:sigstore:sigstore-go:1.0.0
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cpe:2.3:a:sigstore:sigstore-go:1.1.0
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cpe:2.3:a:sigstore:sigstore-go:1.1.1
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cpe:2.3:a:sigstore:sigstore-go:1.1.2
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cpe:2.3:a:sigstore:sigstore-go:1.1.3
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cpe:2.3:a:sigstore:sigstore-go:1.1.4