TI-2026-36738 Aliases CVE-2026-49834 GHSA-9vcr-p3rj-q5q6

sigstore-go: Multi-log threshold bypass via single compromised log

LOW 32CWE-347Published 2026-07-17 · Updated 2026-07-17

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: Partial Red Hat: 1 fixed, 8 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00181 7th percentileScored 2026-11-07

Fix Partial sigstore-go (sigstore): 1.2.0github.com/sigstore/sigstore-go (Go): 1.2.0Red Hat: 3 advisoriesRed Hat: 1 fixed, 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
sigstore	sigstore-go	before 1.2.0	1.2.0	Patch available	CNA
—	github.com/sigstore/sigstore-go (Go)	before 1.2.0	1.2.0	Patch available	GHSA-9vcr-p3rj-q5q6

sigstore-go Vendorsigstore Affected before 1.2.0 Fixed in 1.2.0 Patch available CNA
github.com/sigstore/sigstore-go (Go) Vendor— Affected before 1.2.0 Fixed in 1.2.0 Patch available GHSA-9vcr-p3rj-q5q6

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:sigstore:sigstore-go::::::::	before 1.2.0	Vulnerable	sigstore

cpe:2.3:a:sigstore:sigstore-go:*:*:*:*:*:*:*:* Versions before 1.2.0 Vulnerable ·sigstore

Remediation

Fix · CNA sigstore-go (sigstore) Fixed in 1.2.0
Fix · GHSA-9vcr-p3rj-q5q6 github.com/sigstore/sigstore-go (Go) Fixed in 1.2.0 Advisory →

Red Hat 3 advisories

RHSA-2026:47891 Released 2026-07-29 · Red Hat rating Moderate
Red Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images trivy-main@aarch64, trivy-main@src, trivy-main@x86_64
RHSA-2026:47889 Released 2026-07-29 · Red Hat rating Moderate
Red Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images spire1.14-1.14.7-0.3.hum1@aarch64, spire1.14-1.14.7-0.3.hum1@src, spire1.14-1.14.7-0.3.hum1@x86_64 +6
RHSA-2026:44162 Released 2026-07-23 · Red Hat rating Important
Red Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images spire1.15-1.15.2-0.3.hum1@aarch64, spire1.15-1.15.2-0.3.hum1@src, spire1.15-1.15.2-0.3.hum1@x86_64 +6

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
OpenShift Pipelines	Affected	No fix yet: Fix deferred
Red Hat Advanced Cluster Security 4	Affected	No fix yet: Fix deferred
Red Hat OpenShift Dev Spaces	Affected	No fix yet: Fix deferred
Red Hat Trusted Artifact Signer	Affected	No fix yet: Fix deferred
Red Hat Web Terminal	Affected	No fix planned: Out of support scope
Security Profiles Operator	Affected	No fix yet: Fix deferred
Zero Trust Workload Identity Manager	Affected	No fix yet: Fix deferred
Zero Trust Workload Identity Manager - Tech Preview	Affected	No fix planned: Out of support scope
Red Hat Hardened Images	Fixed	RHSA-2026:44162, RHSA-2026:47889, RHSA-2026:47891

Not affected: 1 product

Red Hat Hardened Images

Timeline

2026-10-02 Threatist record created from CVE-2026-49834
2026-10-03 Alias added: GHSA-9vcr-p3rj-q5q6

References

Patch 2

Advisory 2

Other 2

TI-2024-30444 Unbounded loop over untrusted input can lead to endless data attack CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences