# CVE-2026-22772: Fulcio is vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass

Source: https://junglewise.ai/threats/cve-2026-22772-fulcio-is-vulnerable-to-server-side-request-forgery-ssrf-via  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-23  
License: CC BY 4.0 with a link back

CVE-2026-22772 · Severity: low · CVSS 3.1 · Published 2026-01-23

Fulcio is vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass in github.com/sigstore/fulcio

Technologies: [github.com/sigstore/fulcio (Go)](https://junglewise.ai/threats/technologies/github-com-sigstore-fulcio). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-22772 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-22772 being exploited in the wild.

**How severe is CVE-2026-22772?** Low severity, with a CVSS score of 3.1, published 23 January 2026.

**Which products and versions are affected?** github.com/sigstore/fulcio (Go) SEMVER:introduced=0,fixed=1.8.5.

**Is there a fix for CVE-2026-22772?** Yes. github.com/sigstore/fulcio (Go): upgrade to 1.8.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-22772?** Check whether you run github.com/sigstore/fulcio (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/sigstore/fulcio (Go): upgrade to 1.8.5 or later

  ```sh
  go get github.com/sigstore/fulcio@v1.8.5
  ```


## Affected products

- github.com/sigstore/fulcio (Go) SEMVER:introduced=0,fixed=1.8.5

## Identifiers

- CVE-2026-22772
- GHSA-59jp-pj84-45mr
- GO-2026-4311

## Related threats

- [Sigstore Fulcio SSRF and Token Leakage in OIDC Discovery](https://junglewise.ai/threats/cve-2026-49478-sigstore-fulcio-ssrf-and-token-leakage-in-oidc-discovery)
- [GO-2025-4193 - Fulcio allocates excessive memory during token parsing in github.com/sigstore/fulcio](https://junglewise.ai/threats/cve-2025-66506-fulcio-allocates-excessive-memory-during-token-parsing)