CVE-2026-49834
Medium
Description
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductSigstore-go
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- sigstore sigstore-go1.2.0 or later
- github.com/sigstore/sigstore-go1.2.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| sigstore sigstore-go | v < 1.2.0 | 1.2.0 |
| github.com/sigstore/sigstore-goGo | v < 1.2.0 | 1.2.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.