DEBIAN-CVE-2026-39860
Nix is a package manager for Linux and other Unix systems. A bug in the fix for CVE-2024-27297 allowed for arbitrary overwrites of files writable by the Nix process orchestrating the builds (typically the Nix daemon running as root in multi-user installations) by following symlinks during fixed-output derivation output registration. This affects sandboxed Linux builds - sandboxed macOS builds are unaffected. The location of the temporary output used for the output copy was located inside the build chroot. A symlink, pointing to an arbitrary location in the filesystem, could be created by the derivation builder at that path. During output registration, the Nix process (running in the host mount namespace) would follow that symlink and overwrite the destination with the derivation's output contents. In multi-user installations, this allows all users able to submit builds to the Nix daemon (allowed-users - defaulting to all users) to gain root privileges by modifying sensitive files. This vulnerability is fixed in 2.34.5, 2.33.4, 2.32.7, 2.31.4, 2.30.4, 2.29.3, and 2.28.6.
DEBIAN-CVE-2026-39860
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-39860
nix
Source reference: /affected/0/package/name
- Affected versions
- 2.26.3+dfsg-1
Source reference:
/affected/0/versions2.32.5+dfsg-1Source reference:
/affected/0/versions2.32.5+dfsg-2Source reference:
/affected/0/versions2.34.3+dfsg-1Source reference:
/affected/0/versions2.34.6+dfsg-1Source reference:
/affected/0/versions2.34.8+dfsg-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
nix
Source reference: /affected/1/package/name
- Affected versions
- 2.26.3+dfsg-1
Source reference:
/affected/1/versions2.32.5+dfsg-1Source reference:
/affected/1/versions2.32.5+dfsg-2Source reference:
/affected/1/versions2.34.3+dfsg-1Source reference:
/affected/1/versions - Fixed versions
- 2.34.6+dfsg-1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nix",
"purl": "pkg:deb/debian/nix?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.26.3+dfsg-1",
"2.32.5+dfsg-1",
"2.32.5+dfsg-2",
"2.34.3+dfsg-1",
"2.34.6+dfsg-1",
"2.34.8+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39860.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.34.6+dfsg-1"
}
]
}
],
"package": {
"name": "nix",
"purl": "pkg:deb/debian/nix?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.26.3+dfsg-1",
"2.32.5+dfsg-1",
"2.32.5+dfsg-2",
"2.34.3+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39860.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56864 · Revision 1
- Added to Heist Feed
- Publisher date