CVE-2026-42554

medium

Published 2026-05-11 · Modified 2026-05-13

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CVSS v3

6.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v4 NEW

5.3

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

VIR risk

6.1

Description

Fiber vulnerable to XSS in AutoFormat Content Negotiation

Predictions

Exploit likelihood

71%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/gofiber/fiber/v3	`<3.2.0`	`3.2.0`
Go	github.com/gofiber/fiber/v2	`<2.52.13`	`2.52.13`
GO	github.com/gofiber/fiber/v2	`<= 2.52.12`	`2.52.13`
GO	github.com/gofiber/fiber/v3	`<= 3.1.0`	`3.2.0`

Application impact

Vendor	Product	Versions	Fixed
gofiber	fiber	`{"endExcluding":"2.52.12"}`	`2.52.12`

References

CWEs

CWE-79

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.