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.
Metrics
Affected Vendors & Products
References
History
Tue, 13 Jan 2026 09:30:00 +0000
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Sigstore
Sigstore fulcio |
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Sigstore
Sigstore fulcio |
Mon, 12 Jan 2026 22:15:00 +0000
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ssvc
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Mon, 12 Jan 2026 21:15:00 +0000
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| 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. | |
| Title | Fulcio vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-01-12T21:17:31.478Z
Reserved: 2026-01-09T18:27:19.387Z
Link: CVE-2026-22772
Updated: 2026-01-12T21:17:14.304Z
Status : Received
Published: 2026-01-12T21:15:59.457
Modified: 2026-01-12T21:15:59.457
Link: CVE-2026-22772
No data.
OpenCVE Enrichment
Updated: 2026-01-13T09:27:15Z