What is CVE-2026-25899?

CVE-2026-25899 is a high-severity vulnerability in Gofiber Fiber, classified under CWE-789. CVSS score: 7.5/10. Published 2026-02-24.

How severe is CVE-2026-25899?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Gofiber Fiber

CVE-2026-25899

Fiber is an Express inspired web framework written in Go. In versions on the v3 branch prior to 3.1.0, the use of the `fiber_flash` cookie can force an unbounded allocation on any server. A crafted 10-character cookie value triggers an att…

EPSS: 0.001 (32.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Gofiber Fiber — versions >= 3.0.0, < 3.1.0

Weakness classification (CWE)

CWE-789

References

https://github.com/gofiber/fiber/security/advisories/GHSA-2mr3-m5q5-wgp6 (x_refsource_CONFIRM)
https://github.com/gofiber/fiber/releases/tag/v3.1.0 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-25899?: CVE-2026-25899 is a high-severity vulnerability in Gofiber Fiber, classified under CWE-789. CVSS score: 7.5/10. Published 2026-02-24.
How severe is CVE-2026-25899?: High severity. CVSS v3 base score is 7.5 out of 10.