Secuno
ENNL
Book demo

CVE-2026-25899

Gofiber Fiber denial of service

7.5 HIGHPublic exploitEPSS 0.63%
  1. Published24 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Gofiber Fiber≥ 3.0.0 < 3.1.0

Remediation

Fixed in
Gofiber Fiber≥ 3.1.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1031028.6
Pexip Infinity before 41.0 is affected by improper input validation in the signaling…
CVE-2026-1031018.6
Pexip Infinity 30.0 through 40.x before 41.0 is affected by improper input validation…
CVE-2026-930199.1
Imager versions before 1.036 for Perl exit the process reading a TGA with a colour map…
CVE-2026-202958.6
A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC…
CVE-2026-824359.8
Description The worker's Netty message decoder is installed ahead of the SASL…
CVE-2026-824399.8
Description The DRPC server kept a map from function name to request queue and created…

Frequently asked

Is CVE-2026-25899 being actively exploited?

CVE-2026-25899 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.63%.

How severe is CVE-2026-25899?

CVE-2026-25899 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.63% probability of exploitation.

Which products are affected by CVE-2026-25899?

Affected products include Gofiber Fiber.

How do I fix CVE-2026-25899?

Upgrade affected software to a fixed version, for example Gofiber Fiber 3.1.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25899 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.