How severe is CVE-2026-22772?

CVE-2026-22772 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-22772 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22772?

CVE-2026-22772 affects Linuxfoundation Fulcio. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22772?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-22772 have an EU (EUVD) identifier?

Yes. CVE-2026-22772 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2001.

When was CVE-2026-22772 published?

CVE-2026-22772 was published on 2026-01-12 and last updated on 2026-06-17.

CVE-2026-22772

CVE-2026-22772 is a medium-severity vulnerability in Linuxfoundation Fulcio with a CVSS 3.x base score of 5.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Medium (CVSS 3.x base score 5.8)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2001
Weakness: CWE-918
Affected product: Linuxfoundation Fulcio
Published: 2026-01-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-22772?: 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.
How severe is CVE-2026-22772?: CVE-2026-22772 has a CVSS 3.x base score of 5.8, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-22772 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22772?: CVE-2026-22772 affects Linuxfoundation Fulcio. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22772?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-22772 have an EU (EUVD) identifier?: Yes. CVE-2026-22772 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2001.
When was CVE-2026-22772 published?: CVE-2026-22772 was published on 2026-01-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:linuxfoundation:fulcio:*:*:*:*:*:*:*:*

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