5.8

CVE-2026-25740: nixos nixpkgs Execution with Unnecessary Privileges

CVSS: 5.8v4.0MediumDeferred
Published 09-02-2026Last modified 10-02-2026
Open JSON

Vulnerability summary

CVE-2026-25740 is a medium (CVSS 5.8) Execution with Unnecessary Privileges vulnerability in nixos nixpkgs. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.5% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.8/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.18%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 09-02-2026
    PublishedVulnerability first disclosed.
  2. 10-02-2026
    Last modifiedVulnerability information updated.

Description

captive browser, a dedicated Chrome instance to log into captive portals without messing with DNS settings. In 25.05 and earlier, when programs.captive-browser is enabled, any user of the system can run arbitrary commands with the CAP_NET_RAW capability (binding to privileged ports, spoofing localhost traffic from privileged services...). This vulnerability is fixed in 25.11 and 26.05.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

+0.03 pp

From 0.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Nixos1 product

1 vendor · 1 product

References

3 links