Medium [CVE-2026-22772] Server-Side Request Forgery (SSRF) via unanchored regex in MetaIssuer URL validation
This medium-severity Red Hat Linux advisory covers CVE-2026-22772 affecting rhtas/cosign-rhel9:1770733887, rhtas/gitsign-rhel9:1770108193, rhtas/fulcio-rhel9:1770107446.
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Summary
Server-Side Request Forgery (SSRF) via unanchored regex in MetaIssuer URL validation. Red Hat rates this moderate (CVSS 5.8).
Weakness: CWE-918. Affected package(s): rhtas/cosign-rhel9:1770733887, rhtas/gitsign-rhel9:1770108193, rhtas/fulcio-rhel9:1770107446, rhtas/gitsign-rhel9:1770734283, rhtas/client-server-rhel9:1770789792, rhtas/cosign-rhel9:1770107585.
Resolved in Red Hat advisory RHSA-2026:2136 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux.
- rhtas/cosign-rhel9:1770733887
- rhtas/gitsign-rhel9:1770108193
- rhtas/fulcio-rhel9:1770107446
- rhtas/gitsign-rhel9:1770734283
- rhtas/client-server-rhel9:1770789792
- rhtas/cosign-rhel9:1770107585
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:2136
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:2136 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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