{"id":"CVE-2026-49834","title":"github.com/sigstore/sigstore-go: sigstore-go: Security Policy Bypass via Compromised Log (CVE-2026-49834)","summary":"A flaw was found in sigstore-go, a Go library for Sigstore signing and verification. This vulnerability allows a single compromised transparency log or Certificate Transparency (CT) log to bypass the multi-log threshold requirements. An at…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","cvssSource":"vendor","cwe":["CWE-347","CWE-345"],"vendor":"Red Hat","product":"Red Hat Trusted Artifact Signer","affected":["openshift_pipelines","advanced_cluster_security 4","openshift_dev_spaces","trusted_artifact_signer","web_terminal","security_profiles_operator","zero_trust_workload_identity_manager","zero_trust_workload_identity_manager_tech_preview","hardened_images"],"patched":["hardened_images"],"published":"2026-07-17","updated":"2026-09-10","sourceUpdated":"2026-09-10T15:03:48+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49834.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49834.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-49834"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2501871"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-49834"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49834"},{"url":"https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207"},{"url":"https://github.com/sigstore/sigstore-go/pull/633"},{"url":"https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0"},{"url":"https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6"},{"url":"https://access.redhat.com/errata/RHSA-2026:47889"},{"url":"https://access.redhat.com/errata/RHSA-2026:44162"},{"url":"https://access.redhat.com/errata/RHSA-2026:47891"},{"url":"https://github.com/advisories/GHSA-9vcr-p3rj-q5q6"}],"tags":["csaf","vex","red-hat","ghsa","go"],"epss":0.00113,"epssPercentile":0.01597,"aliases":["GHSA-9vcr-p3rj-q5q6"],"ecosystem":"go","ingestedAt":"2026-07-09T23:53:27.219Z","slug":"CVE-2026-49834","body":"## Overview\n\nA flaw was found in sigstore-go, a Go library for Sigstore signing and verification. This vulnerability allows a single compromised transparency log or Certificate Transparency (CT) log to bypass the multi-log threshold requirements. An attacker could exploit this by compromising a single log, thereby defeating the intended security policy and potentially compromising the integrity of the verification process.\n\n## Vendor advisories\n\n- **RHSA-2026:47889** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47889)\n- **RHSA-2026:44162** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:44162)\n- **RHSA-2026:47891** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47891)\n- **Red Hat VEX** · Moderate · affected: OpenShift Pipelines, Red Hat Advanced Cluster Security 4, Red Hat OpenShift Dev Spaces, Red Hat Trusted Artifact Signer, Red Hat Web Terminal, Security Profiles Operator, … · no fix planned: Red Hat Advanced Cluster Security 4, Red Hat Trusted Artifact Signer, Red Hat Web Terminal, Zero Trust Workload Identity Manager - Tech Preview, … · updated 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49834.json)\n\n**github.com/sigstore/sigstore-go: sigstore-go: Security Policy Bypass via Compromised Log** — rated Moderate by Red Hat. Released 2026-07-17, updated 2026-09-10.\n\nAffected:\n\n- OpenShift Pipelines\n- Red Hat Advanced Cluster Security 4\n- Red Hat OpenShift Dev Spaces\n- Red Hat Trusted Artifact Signer\n- Red Hat Web Terminal\n- Security Profiles Operator\n- Zero Trust Workload Identity Manager\n- Zero Trust Workload Identity Manager - Tech Preview\n\nFixed:\n\n- Red Hat Hardened Images\n\nNo fix planned:\n\n- Red Hat Advanced Cluster Security 4\n- Red Hat Trusted Artifact Signer\n- Red Hat Web Terminal\n- Zero Trust Workload Identity Manager - Tech Preview\n- OpenShift Pipelines\n- Red Hat OpenShift Dev Spaces\n- Security Profiles Operator\n- Zero Trust Workload Identity Manager\n\nNot affected:\n\n- Red Hat Hardened Images\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:47889\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:44162\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:47891\n\n## Package advisory (CVE-2026-49834)\n\nAffected packages:\n\n- `github.com/sigstore/sigstore-go <= 1.1.4`\n\nPatched in:\n\n- `github.com/sigstore/sigstore-go 1.2.0`\n\nSource: https://github.com/advisories/GHSA-9vcr-p3rj-q5q6","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}