# CVE-2026-22772: golang-github-sigstore-fulcio: Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity

CVE-2026-22772 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-22772, released January 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-22772
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 12, 2026

## Description

Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.5, Fulcio's metaRegex() function uses unanchored regex, allowing attackers to bypass MetaIssuer URL validation and trigger SSRF to arbitrary internal services. Since the SSRF only can trigger GET requests, the request cannot mutate state. The response from the GET request is not returned to the caller so data exfiltration is not possible. A malicious actor could attempt to probe an internal network through Blind SSRF. This vulnerability is fixed in 1.8.5.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | cosign opensuse-leap 15.6 | 3.0.5-150400.3.35.1 | [SUSE-SU-2026:0777-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0777-1.md) | Mar 3, 2026 |
| Linux | cosign opensuse-leap 16.0 | 3.0.5-160000.1.1 | [OPENSUSE-SU-2026:20386-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20386-1.md) | Mar 18, 2026 |
| Linux | cosign sles 15.7 | 3.0.5-150400.3.35.1 | [SUSE-SU-2026:0777-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0777-1.md) | Mar 3, 2026 |
| Linux | cosign sles 16.0 | 3.0.5-160000.1.1 | [SUSE-SU-2026:20904-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20904-1.md) | Mar 18, 2026 |
| Linux | golang-github-sigstore-fulcio Debian 14 | 1.8.5-1 | [DEBIAN-CVE-2026-22772](https://patchblox.com/security/data/fix/linux/debian-cve-2026-22772.md) | Jan 12, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 15.6 | 0.0.20260123T022811-150000.1.140.1 | [SUSE-SU-2026:0292-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0292-1.md) | Jan 26, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |
| Linux | hauler opensuse-leap 16.0 | 1.4.1-bp160.1.1 | [OPENSUSE-RU-2026:20161-1](https://patchblox.com/security/data/fix/linux/opensuse-ru-2026-20161-1.md) | Jan 27, 2026 |
| Linux | runfinch-finch amzn 2023 | 1.15.1-1.amzn2023.0.1 | [ALAS2023-2026-1507](https://patchblox.com/security/data/fix/linux/alas2023-2026-1507.md) | Mar 30, 2026 |
| Linux | vexctl opensuse-leap 15.6 | 0.4.1+git78.f951e3a-150000.1.11.1 | [SUSE-SU-2026:0592-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0592-1.md) | Feb 20, 2026 |
| Linux | vexctl opensuse-leap 16.0 | 0.4.4+git20.5d61136-160000.1.1 | [OPENSUSE-SU-2026:21481-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21481-1.md) | Jul 30, 2026 |

---

Data as of 2026-11-08T06:59:42Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.