CVE-2026-44608

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2026-05-20. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers) it could result in heap use-after-free and eventual crash. An adversary can exploit the vulnerability if conditions are first met on a vulnerable Unbound, i.e., multi-threaded, an RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers and an ongoing XFR for that RPZ zone. Local RPZ files do not trigger the vulnerability. If the timing is right and an XFR happens at the same time another thread needs to read that RPZ zone, the reader may not hold the lock long enough and the thread applying the XFR may free objects that the reader is about to walk causing the use-after-free. Unbound 1.25.1 contains a patch with a fix to the locking code.

CVSS v3
5.9
EG Score
5.9(medium)
EPSS
16.9%
KEV
Not listed

Published

May 20, 2026

Last Modified

May 20, 2026

Advisory Details (1)

Auto-updated May 20, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44608.txt

Vendor Advisories for CVE-2026-44608(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuunbound-host (1.19.2-1ubuntu3.8) @ noble2026-06-29ubuntu
redhatunbound-main-1.25.1-0.1.hum12026-05-20redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 63× 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 131 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44608?
CVE-2026-44608 is a medium vulnerability published on May 20, 2026. NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers) it could result in heap use-after-free and eventual crash. An adversary can…
When was CVE-2026-44608 disclosed?
CVE-2026-44608 was first published in the National Vulnerability Database on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44608 actively exploited?
CVE-2026-44608 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44608?
CVE-2026-44608 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-44608?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44608, 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.

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