Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
sigstore fulcio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fulcio是sigstore开源的一个证书颁发机构。 Fulcio 1.8.5之前版本存在代码问题漏洞，该漏洞源于MetaIssuer URL验证使用未锚定的正则表达式，可能导致绕过验证并触发针对任意内部服务的盲SSRF攻击。

CVSS 5.8 · Medium EPSS 0.24% · P13
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-22772

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Fulcio vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Fulcio 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fulcio是sigstore开源的一个证书颁发机构。 Fulcio 1.8.5之前版本存在代码问题漏洞，该漏洞源于MetaIssuer URL验证使用未锚定的正则表达式，可能导致绕过验证并触发针对任意内部服务的盲SSRF攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sigstore fulcio < 1.8.5 -

II. Public POCs for CVE-2026-22772

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-22772

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-22772 (1)

IV. Related Vulnerabilities

Same product: fulcio
Same vendor: sigstore
Same weakness: CWE-918

V. Comments for CVE-2026-22772

No comments yet

Leave a comment