CVE catalog
CVE-2026-44028
An issue was discovered in Nix before 2.34.7 and Lix before 2.95.2. Unbounded recursion in the NAR (Nix Archive) parser could lead to a stack-to-heap overflow when the parser is run on a coroutine sta
- Severity
- High · CVSS 7.8
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.18% · Oct 25, 2026
An issue was discovered in Nix before 2.34.7 and Lix before 2.95.2. Unbounded recursion in the NAR (Nix Archive) parser could lead to a stack-to-heap overflow when the parser is run on a coroutine stack. The stack is allocated without a guard page, which means that a stack overflow could overwrite memory on the heap and could allow arbitrary code execution as the Nix daemon (run as root in multi-user installations) if ASLR hardening is bypassed. This can be exploited by all users able to connect to the daemon (e.g., in Nix, this is configurable via the allowed-users setting, defaulting to all users). The fixed versions are 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, and 2.28.7 for Nix (introduced in 2.24.4); and 2.95.2, 2.94.2, and 2.93.4 for Lix (introduced in 2.93.0).
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | nix | sid | 2.34.8+dfsg-1 | fixed |
| Debian | nix | forky | 2.34.8+dfsg-1 | fixed |
| Debian | nix | trixie | 2.26.3+dfsg-1 | vulnerable |
| Debian | nix | bookworm | 2.8.0-1.1 | not affected |
| Opensuse | nix | tumbleweed | 2.34.7-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nix | source | sid | 2.34.8+dfsg-1 | not yet assigned | Not reported | [1135777] |
| Debian | nix | source | forky | 2.34.8+dfsg-1 | not yet assigned | Not reported | [1135777] |
| Debian | nix | source | trixie | (unfixed) | not yet assigned | Not reported | [1135777] |
| Debian | nix | source | bookworm | Not affected | unimportant | Not reported | [1135777] |
| Opensuse | nix | rpm | tumbleweed | 2.34.7-1.1 | Not reported | OPENSUSE-SU-2026:10696-1 | Not reported |
Notes
[trixie] nix: Minor issue
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [nix-bin]Affected
Source package: [nix]
Details (2)
2.26.3+dfsg-1· amd64 · trixieAffected
nvd · nix · debian · 13
2.26.3+dfsg-1· arm64 · trixieAffected
nvd · nix · debian · 13
- [nix-setup-systemd]Affected
Source package: [nix]
Details (2)
2.26.3+dfsg-1· all · trixieAffected
nvd · nix · debian · 13
2.26.3+dfsg-1· all · trixieAffected
nvd · nix · debian · 13
[openSUSE Tumbleweed]
- [nix-bash-completion]Unknown
Source package: [nix]
Details (1)
2.35.2-1.1· noarch · tumbleweedUnknown · Fixed:
2.34.7-1.1Version impact unknown
nvd · nix · opensuse · tumbleweed
- [nix-devel]Unknown
Source package: [nix]
Details (1)
2.35.2-1.1· x86_64 · tumbleweedUnknown · Fixed:
2.34.7-1.1Version impact unknown
nvd · nix · opensuse · tumbleweed
- [nix-fish-completion]Unknown
Source package: [nix]
Details (1)
2.35.2-1.1· noarch · tumbleweedUnknown · Fixed:
2.34.7-1.1Version impact unknown
nvd · nix · opensuse · tumbleweed
- [nix-zsh-completion]Unknown
Source package: [nix]
Details (1)
2.35.2-1.1· noarch · tumbleweedUnknown · Fixed:
2.34.7-1.1Version impact unknown
nvd · nix · opensuse · tumbleweed
- [nix]Fixed
Source package: [nix]
Details (1)
2.35.2-1.1· x86_64 · tumbleweedFixed · Fixed:
2.34.7-1.1nvd · nix · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [nix-bin]Not affected
Source package: [nix]
Details (2)
2.8.0-1.1· arm64 · bookwormNot affected
nvd · nix · debian · bookworm
2.8.0-1.1+b1· amd64 · bookwormNot affected
nvd · nix · debian · bookworm
- [nix-setup-systemd]Not affected
Source package: [nix]
Details (2)
2.8.0-1.1· all · bookwormNot affected
nvd · nix · debian · bookworm
2.8.0-1.1· all · bookwormNot affected
nvd · nix · debian · bookworm
Observed:
References
- [https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10696-1.json]
- [https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368]
- [https://lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-44028]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-44028]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10696-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-44028]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44028.json]
- [https://www.openwall.com/lists/oss-security/2026/05/04/32]
- [https://www.openwall.com/lists/oss-security/2026/05/04/33]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]