CVE-2026-44028

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-05. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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).

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

May 5, 2026

Last Modified

May 9, 2026

Advisory Details (4)

Auto-updated May 5, 2026
Patch available. Sources: github.
generic

oss-security - Local privilege escalation in Lix and Nix

https://www.openwall.com/lists/oss-security/2026/05/04/33
generic

oss-security - Nix/Lix: local privilege escalation in daemon process

https://www.openwall.com/lists/oss-security/2026/05/04/32
github Patch Available

Coroutine stack-to-heap overflow via unbounded recursion in NAR directory parser · Advisory · NixOS/nix · GitHub

https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368
generic

Security Advisory: Local privilege escalation in Lix and Nix - Security - NixOS Discourse

https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407

Vendor Advisories for CVE-2026-44028(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatruff-main-0.15.11-1.hum12026-04-27redhat
redhatchunkah-main-0.4.0-1.hum12026-04-23redhat
redhatrust-main-1.95.0-2.hum12026-04-21redhat
redhatbootc-main-1.14.0-0.1.1.hum12026-04-08redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nix2.26.3+dfsg-1 ... 2.34.8+dfsg-1 (6 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nix2.26.3+dfsg-1, 2.32.5+dfsg-1, 2.32.5+dfsg-2, 2.34.3+dfsg-1, 2.34.6+dfsg-12.34.8+dfsg-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 205 total refreshes for this CVE.

  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 17:40 UTCOSV refresh
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-01 13:54 UTCEPSS rescore
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 01:22 UTCEPSS rescore
  15. 2026-08-28 21:41 UTCEPSS rescore
  16. 2026-08-27 14:25 UTCEPSS rescore
  17. 2026-08-26 14:46 UTCEPSS rescore
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-23 21:15 UTCEG score recompute
  20. 2026-08-23 21:15 UTCVendor advisory
  21. 2026-08-23 21:15 UTCGHSA enrichment
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-21 23:49 UTCEPSS rescore
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-19 17:04 UTCEPSS rescore
Show 75 more
  1. 2026-08-18 13:48 UTCEPSS rescore
  2. 2026-08-17 13:47 UTCEPSS rescore
  3. 2026-08-17 13:05 UTCEG score recompute
  4. 2026-08-17 13:05 UTCVendor advisory
  5. 2026-08-17 13:05 UTCGHSA enrichment
  6. 2026-08-16 14:56 UTCEPSS rescore
  7. 2026-08-16 05:01 UTCEG score recompute
  8. 2026-08-16 05:01 UTCVendor advisory
  9. 2026-08-16 05:01 UTCGHSA enrichment
  10. 2026-08-16 02:14 UTCEPSS rescore
  11. 2026-08-15 01:30 UTCEPSS rescore
  12. 2026-08-14 16:59 UTCVendor advisory
  13. 2026-08-14 16:59 UTCGHSA enrichment
  14. 2026-08-14 03:37 UTCEG score recompute
  15. 2026-08-14 03:37 UTCVendor advisory
  16. 2026-08-14 03:37 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 06:35 UTCVendor advisory
  19. 2026-08-13 06:35 UTCGHSA enrichment
  20. 2026-08-12 17:14 UTCEG score recompute
  21. 2026-08-12 17:14 UTCVendor advisory
  22. 2026-08-12 17:14 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-11 16:06 UTCEG score recompute
  25. 2026-08-11 16:06 UTCVendor advisory
  26. 2026-08-11 16:06 UTCGHSA enrichment
  27. 2026-08-11 13:43 UTCEPSS rescore
  28. 2026-08-11 01:39 UTCEG score recompute
  29. 2026-08-11 01:39 UTCVendor advisory
  30. 2026-08-11 01:38 UTCGHSA enrichment
  31. 2026-08-11 00:00 UTCEPSS rescore
  32. 2026-08-10 05:00 UTCVendor advisory
  33. 2026-08-10 05:00 UTCGHSA enrichment
  34. 2026-08-09 15:51 UTCEG score recompute
  35. 2026-08-09 15:51 UTCVendor advisory
  36. 2026-08-09 15:51 UTCGHSA enrichment
  37. 2026-08-09 13:46 UTCEPSS rescore
  38. 2026-08-09 02:42 UTCEG score recompute
  39. 2026-08-09 02:42 UTCVendor advisory
  40. 2026-08-09 02:42 UTCGHSA enrichment
  41. 2026-08-08 16:37 UTCEPSS rescore
  42. 2026-08-08 04:29 UTCEG score recompute
  43. 2026-08-08 04:29 UTCVendor advisory
  44. 2026-08-08 04:29 UTCGHSA enrichment
  45. 2026-08-07 15:20 UTCVendor advisory
  46. 2026-08-07 15:20 UTCGHSA enrichment
  47. 2026-08-07 02:12 UTCEG score recompute
  48. 2026-08-07 02:12 UTCVendor advisory
  49. 2026-08-07 02:12 UTCGHSA enrichment
  50. 2026-08-06 13:46 UTCEPSS rescore
  51. 2026-08-06 11:46 UTCVendor advisory
  52. 2026-08-06 11:46 UTCGHSA enrichment
  53. 2026-08-05 22:27 UTCEG score recompute
  54. 2026-08-05 22:27 UTCVendor advisory
  55. 2026-08-05 22:27 UTCGHSA enrichment
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-04 15:10 UTCEPSS rescore
  58. 2026-08-04 10:38 UTCEPSS rescore
  59. 2026-08-03 20:00 UTCEG score recompute
  60. 2026-08-03 20:00 UTCVendor advisory
  61. 2026-08-03 20:00 UTCGHSA enrichment
  62. 2026-08-03 10:36 UTCEPSS rescore
  63. 2026-08-02 18:32 UTCVendor advisory
  64. 2026-08-02 18:32 UTCGHSA enrichment
  65. 2026-08-02 05:23 UTCEG score recompute
  66. 2026-08-02 05:23 UTCVendor advisory
  67. 2026-08-02 05:23 UTCGHSA enrichment
  68. 2026-08-02 02:27 UTCEPSS rescore
  69. 2026-08-01 04:16 UTCEPSS rescore
  70. 2026-07-30 16:28 UTCEPSS rescore
  71. 2026-07-30 01:30 UTCEPSS rescore
  72. 2026-07-28 15:36 UTCEPSS rescore
  73. 2026-07-27 14:13 UTCEPSS rescore
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-26 14:54 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-44028?
CVE-2026-44028 is a high vulnerability published on May 5, 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…
When was CVE-2026-44028 disclosed?
CVE-2026-44028 was first published in the National Vulnerability Database on May 5, 2026, with the most recent update on May 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44028 actively exploited?
CVE-2026-44028 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.3% of all scored CVEs.
What is the CVSS score of CVE-2026-44028?
CVE-2026-44028 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-44028?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44028, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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