Upstream information
Description
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Versions 2.0.5 and below contain an authorization bypass vulnerability in the VerifyTimestampResponse function. VerifyTimestampResponse correctly verifies the certificate chain signature, but the TSA-specific constraint checks in VerifyLeafCert uses the first non-CA certificate from the PKCS#7 certificate bag instead of the leaf certificate from the verified chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key, causing the library to validate the signature against one certificate but perform authorization checks against another. This vulnerability only affects users of the timestamp-authority/v2/pkg/verification package and does not affect the timestamp-authority service itself or sigstore-go. The issue has been fixed in version 2.0.6.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 5.5 | 5.5 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
| Attack Vector | Local | Local |
| Attack Complexity | Low | Low |
| Privileges Required | None | None |
| User Interaction | Required | Required |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | High | High |
| Availability Impact | None | None |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 6.8 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| Attack Vector | Local |
| Attack Complexity | Low |
| Attack Requirements | None |
| Privileges Required | None |
| User Interaction | Passive |
| Vulnerable System Confidentiality Impact | None |
| Vulnerable System Integrity Impact | High |
| Vulnerable System Availability Impact | None |
| Subsequent System Confidentiality Impact | None |
| Subsequent System Integrity Impact | None |
| Subsequent System Availability Impact | None |
| CVSSv4 Version | 4.0 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP7 | cosign | Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | docker | Not affected |
| SUSE Linux Enterprise Micro 5.2 | docker | Not affected |
| SUSE Linux Enterprise Micro 5.3 | docker | Not affected |
| SUSE Linux Enterprise Micro 5.4 | docker | Not affected |
| SUSE Linux Enterprise Micro 5.5 | docker | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | cosign | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 15 SP7 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP7 | cosign | Affected |
| SUSE Linux Enterprise Server 15 SP7 | docker | Not affected |
| SUSE Linux Enterprise Server 16.0 | cosign | Affected |
| SUSE Linux Enterprise Server 16.0 | docker | Not affected |
| SUSE Linux Enterprise Server 16.0 | vexctl | Not affected |
| SUSE Linux Enterprise Server 16.1 | cosign | Affected |
| SUSE Linux Enterprise Server 16.1 | docker | Affected |
| SUSE Linux Enterprise Server 16.1 | vexctl | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | cosign | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | cosign | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | vexctl | Not affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | cosign | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | docker | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | vexctl | Not affected |
| SUSE Linux Micro 6.0 | docker | Not affected |
| SUSE Linux Micro 6.1 | docker | Not affected |
| SUSE Linux Micro 6.2 | docker | Not affected |
| openSUSE Leap 15.6 | cosign | Affected |
| openSUSE Leap 15.6 | docker | Not affected |
| openSUSE Leap 15.6 | vexctl | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SLES15-SP3-CHOST-BYOS-Aliyun | docker | Not affected |
| SLES15-SP3-CHOST-BYOS-Azure | docker | Not affected |
| SLES15-SP3-CHOST-BYOS-EC2 | docker | Not affected |
| SLES15-SP3-CHOST-BYOS-GCE | docker | Not affected |
| SLES15-SP3-CHOST-BYOS-SAP-CCloud | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | docker | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | cosign | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | cosign | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | cosign | Affected |
| SUSE Linux Enterprise Module for Containers 15 SP4 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 15 SP5 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 15 SP6 | docker | Not affected |
| SUSE Linux Enterprise Server 12 SP5 | docker | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | cosign | Affected |
| SUSE Linux Enterprise Server 15 SP4 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | cosign | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | cosign | Affected |
| SUSE Linux Enterprise Server 15 SP5 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | cosign | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | cosign | Affected |
| SUSE Linux Enterprise Server 15 SP6 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | cosign | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | cosign | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | docker | Not affected |
| SUSE Manager Proxy 4.3 | cosign | Affected |
| SUSE Manager Proxy 4.3 | docker | Not affected |
| SUSE Manager Proxy LTS 4.3 | cosign | Affected |
| SUSE Manager Retail Branch Server 4.3 | cosign | Affected |
| SUSE Manager Retail Branch Server 4.3 | docker | Not affected |
| SUSE Manager Retail Branch Server LTS 4.3 | cosign | Affected |
| SUSE Manager Server 4.3 | cosign | Affected |
| SUSE Manager Server 4.3 | docker | Not affected |
| SUSE Manager Server LTS 4.3 | cosign | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE CaaS Platform 3.0 | docker | Not affected |
| SUSE CaaS Platform 4.0 | docker | Not affected |
| SUSE Enterprise Storage 6 | docker | Not affected |
| SUSE Enterprise Storage 7 | docker | Not affected |
| SUSE Enterprise Storage 7.1 | docker | Not affected |
| SUSE Linux Enterprise Desktop 15 SP4 | cosign | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | cosign | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | cosign | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | docker | Not affected |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | docker | Not affected |
| SUSE Linux Enterprise Micro 5.0 | docker | Not affected |
| SUSE Linux Enterprise Micro 5.1 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 12 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 15 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 15 SP1 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 15 SP2 | docker | Not affected |
| SUSE Linux Enterprise Module for Containers 15 SP3 | docker | Not affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | vexctl | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | vexctl | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | cosign | Affected |
| SUSE Linux Enterprise Server 12 | docker | Not affected |
| SUSE Linux Enterprise Server 12 SP3 | docker | Not affected |
| SUSE Linux Enterprise Server 12 SP4 | docker | Not affected |
| SUSE Linux Enterprise Server 15 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP1 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP3 | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | docker | Not affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server 15-LTSS | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | cosign | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | docker | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | cosign | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | docker | Not affected |
| SUSE Manager Proxy 4.0 | docker | Not affected |
| SUSE Manager Proxy 4.1 | docker | Not affected |
| SUSE Manager Proxy 4.2 | docker | Not affected |
| SUSE Manager Retail Branch Server 4.0 | docker | Not affected |
| SUSE Manager Retail Branch Server 4.1 | docker | Not affected |
| SUSE Manager Retail Branch Server 4.2 | docker | Not affected |
| SUSE Manager Server 4.0 | docker | Not affected |
| SUSE Manager Server 4.1 | docker | Not affected |
| SUSE Manager Server 4.2 | docker | Not affected |
| SUSE OpenStack Cloud 6 | docker | Not affected |
| SUSE OpenStack Cloud 6-LTSS | docker | Not affected |
| openSUSE Leap 15.3 | docker | Not affected |
| openSUSE Leap 15.4 | cosign | Affected |
| openSUSE Leap 15.4 | docker | Not affected |
| openSUSE Leap 15.5 | cosign | Affected |
| openSUSE Leap 15.5 | docker | Not affected |
| openSUSE Leap 15.5 | vexctl | Affected |
| openSUSE Leap Micro 5.2 | docker | Not affected |
| openSUSE Leap Micro 5.3 | docker | Not affected |
| openSUSE Leap Micro 5.4 | docker | Not affected |
| openSUSE Leap Micro 5.5 | docker | Not affected |
| Container Status | ||
| suse/cosign | cosign | Affected |
SUSE Timeline for this CVE
CVE page created: Thu Apr 16 16:00:18 2026CVE page last modified: Mon Apr 20 17:35:39 2026