Wiz Agents & Workflows are here
Wiz
Vulnerability DatabaseCVE-2025-5271

CVE-2025-5271: 
NixOS vulnerability analysis and mitigation

Overview

CVE-2025-5271 is a security vulnerability discovered in Firefox versions prior to 139, where the DevTools preview feature failed to respect Content Security Policy (CSP) headers. The vulnerability was reported by Satoki Tsuji and was officially disclosed on May 27, 2025 (Mozilla Advisory, NVD).

Technical details

The vulnerability stems from the DevTools preview functionality ignoring Content Security Policy headers when previewing responses. It has been assigned a CVSS v3.1 base score of 6.5 (MEDIUM) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N. The vulnerability is classified under CWE-116 (Improper Encoding or Escaping of Output) (NVD, Wiz Analysis).

Impact

The vulnerability has been rated as having a low impact. By bypassing CSP headers, the flaw could potentially allow content injection attacks when using the DevTools preview feature (Mozilla Advisory, Wiz Analysis).

Mitigation and workarounds

The vulnerability has been fixed in Firefox version 139. Users are advised to update to this version or later to mitigate the risk. No specific workarounds have been provided for users who cannot immediately update (Mozilla Advisory).

Additional resources

Source: This report was generated using AI

Related NixOS vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-30892HIGH7.8
  • NixOSNixOS
  • crun
NoYesMar 26, 2026
CVE-2026-33223MEDIUM5.4
  • NixOSNixOS
  • k3s-1.33
NoYesMar 25, 2026
CVE-2026-33222MEDIUM4.9
  • NixOSNixOS
  • k3s-1.32
NoYesMar 25, 2026
CVE-2026-33249MEDIUM4.3
  • NixOSNixOS
  • k3s-1.32
NoYesMar 25, 2026
CVE-2026-33248MEDIUM4.2
  • NixOSNixOS
  • github.com/nats-io/nats-server/v2
NoYesMar 25, 2026

Free Vulnerability Assessment

Benchmark your Cloud Security Posture

Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.

Request assessment

Additional Wiz resources

Cloud Vulnerability DB

Cloud Vulnerability DB

A community-led vulnerabilities database

Cloud Threat Landscape

Cloud Threat Landscape

A threat intelligence database

PEACH

PEACH

A tenant isolation framework

Get a personalized demo

Ready to see Wiz in action?

"Best User Experience I have ever seen, provides full visibility to cloud workloads."
David EstlickCISO
"Wiz provides a single pane of glass to see what is going on in our cloud environments."
Adam FletcherChief Security Officer
"We know that if Wiz identifies something as critical, it actually is."
Greg PoniatowskiHead of Threat and Vulnerability Management
Get a demo