# SUSE-SU-2026:20904-1: cosign security update

SUSE-SU-2026:20904-1, released March 18, 2026, fixes 9 CVEs in cosign (version 3.0.5-160000.1.1). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/suse-su-2026-20904-1
- Platform: Linux
- Released: Mar 18, 2026
- Priority: High (Closes CVE-2026-23991, high severity)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/SUSE-SU-2026:20904-1

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [cosign](https://patchblox.com/security/data/product/linux/cosign.md) | sles 16.0 | 3.0.5-160000.1.1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-23991](https://patchblox.com/security/data/cve/CVE-2026-23991.md) | High | cosign: github.com/theupdateframework/go-tuf/v2: denial of service due to invalid TUF metadata JSON returned | 7.5 | 0.0058 |  |
| [CVE-2026-23992](https://patchblox.com/security/data/cve/CVE-2026-23992.md) | High | cosign: github.com/theupdateframework/go-tuf/v2: unauthorized modification to TUF metadata files due to a | 7.5 | 0.0022 |  |
| [CVE-2025-58181](https://patchblox.com/security/data/cve/CVE-2025-58181.md) | Routine | apptainer: Fixed unbounded memory consumption in | 5.3 | 0.0060 |  |
| [CVE-2025-11065](https://patchblox.com/security/data/cve/CVE-2025-11065.md) | Routine | grafana: Fixed sensitive information leak in logs (version 11.5.9) (bsc#1250616) | 5.3 | 0.0052 |  |
| [CVE-2026-26958](https://patchblox.com/security/data/cve/CVE-2026-26958.md) | Routine | alloy: filippo.io/edwards25519: failure to initialize receiver in MultiScalarMult can produce invalid results | n/a | 0.0042 |  |
| [CVE-2026-24137](https://patchblox.com/security/data/cve/CVE-2026-24137.md) | Routine | apptainer: github.com/sigstore/sigstore/pkg/tuf: legacy TUF client allows for arbitrary file writes with target | 5.8 | 0.0039 |  |
| [CVE-2026-22772](https://patchblox.com/security/data/cve/CVE-2026-22772.md) | Routine | cosign: github.com/sigstore/fulcio: bypass MetaIssuer URL validation bypass can trigger SSRF to arbitrary | 5.3 | 0.0023 |  |
| [CVE-2026-24122](https://patchblox.com/security/data/cve/CVE-2026-24122.md) | Routine | cosign: improper validation of certificates that outlive expired CA certificates (bsc#1258542). | 3.7 | 0.0022 |  |
| [CVE-2026-22703](https://patchblox.com/security/data/cve/CVE-2026-22703.md) | Routine | cosign: Verification accepts any valid Rekor entry under certain conditions (bsc#1256496). | 5.5 | 0.0011 |  |

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Data as of 2026-11-11T01:43:54Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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