CVE-2026-39984 | sigstore timestamp-authority up to 2.0.5 certificate validation

VDB-357296 · CVE-2026-39984 · GCVE-0-2026-39984 SIGSTORE TIMESTAMP-AUTHORITY UP TO 2.0.5 CERTIFICATE VALIDATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.8 $0-$5k 3.16 Summaryinfo A vulnerability, which was classified as critical, was found in sigstore timestamp-authority up to 2.0.5. Impacted is an unknown function. Such manipulation leads to certificate validation. This vulnerability is documented as CVE-2026-39984. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in sigstore timestamp-authority up to 2.0.5 and classified as critical. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a certificate validation vulnerability. Using CWE to declare the problem leads to CWE-295. The product does not validate, or incorrectly validates, a certificate. Impacted is confidentiality, integrity, and availability. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-39984. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1587.003. Upgrading to version 2.0.6 eliminates this vulnerability. Productinfo Vendor sigstore Name timestamp-authority Version 2.0.0 2.0.1 2.0.2 2.0.3 2.0.4 2.0.5 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.0 VulDB Meta Temp Score: 4.8 VulDB Base Score: 5.0 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Certificate validation CWE: CWE-295 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: timestamp-authority 2.0.6 Timelineinfo 04/14/2026 Advisory disclosed 04/14/2026 +0 days VulDB entry created 04/14/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-39984 (🔒) GCVE (CVE): GCVE-0-2026-39984 GCVE (VulDB): GCVE-100-357296 Entryinfo Created: 04/14/2026 09:29 Changes: 04/14/2026 09:29 (51) Complete: 🔍 Cache ID: 99:7AD:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸