How severe is CVE-2026-25891?

CVE-2026-25891 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-25891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25891?

CVE-2026-25891 affects Gofiber Fiber. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25891?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25891 have an EU (EUVD) identifier?

Yes. CVE-2026-25891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8565.

When was CVE-2026-25891 published?

CVE-2026-25891 was published on 2026-02-24 and last updated on 2026-06-17.

CVE-2026-25891

CVE-2026-25891 is a high-severity vulnerability in Gofiber Fiber with a CVSS 3.x base score of 7.5. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 7.7
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8565
Weakness: CWE-22
Affected product: Gofiber Fiber
Published: 2026-02-24
Last modified: 2026-06-17

Description

Fiber is an Express inspired web framework written in Go. A Path Traversal (CWE-22) vulnerability in Fiber allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server file system on Windows. This affects Fiber v3 through version 3.0.0. This has been patched in Fiber v3 version 3.1.0.

Frequently asked questions

What is CVE-2026-25891?: Fiber is an Express inspired web framework written in Go. A Path Traversal (CWE-22) vulnerability in Fiber allows a remote attacker to bypass the static middleware sanitizer and read arbitrary files on the server file system on Windows. This affects Fiber v3 through version 3.0.0. This has been patched in Fiber v3 version 3.1.0.
How severe is CVE-2026-25891?: CVE-2026-25891 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-25891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25891?: CVE-2026-25891 affects Gofiber Fiber. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25891 have an EU (EUVD) identifier?: Yes. CVE-2026-25891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8565.
When was CVE-2026-25891 published?: CVE-2026-25891 was published on 2026-02-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gofiber:fiber:*:*:*:*:*:go:*:*

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