Medium 5.8Published Feb 9, 2026

CVE-2026-25740Privilege escalation to the `CAP_NET_RAW` capability via the `programs.captive-browser` NixOS module

Updated under an hour ago (Oct 28, 2026, 1:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.8 MEDIUM (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-250
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Feb 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

NixOS nixpkgs nixos:nixpkgs (from the name)	through 25.05	CNA record

References

References

https://github.com/NixOS/nixpkgs/security/advisories/GHSA-wc3r-c66x-8xmc	x-refsource-confirm
https://github.com/NixOS/nixpkgs/pull/487775	x-refsource-misc
https://github.com/NixOS/nixpkgs/pull/487779	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.