CVE-2026-25899

HIGH

7.5

Description

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 attempt to allocate up to 85GB of memory via unvalidated msgpack deserialization. No authentication is required. Every GoFiber v3 endpoint is affected regardless of whether the application uses flash messages. Version 3.1.0 fixes the issue.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/24/2026

Last Modified2/25/2026

Sourcenvd

Honeypot Sightings0

Affected Products

gofiber:fiber

Weaknesses (CWE)

CWE-789CWE-770

References

https://github.com/gofiber/fiber/releases/tag/v3.1.0(security-advisories@github.com)

https://github.com/gofiber/fiber/security/advisories/GHSA-2mr3-m5q5-wgp6(security-advisories@github.com)

IOC Correlations

No correlations recorded

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