CVE-2026-42009

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-18. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
69%
KEV
Not listed

Published

May 18, 2026

Last Modified

August 25, 2026

Advisory Details (2)

Auto-updated May 18, 2026
Patch available. Sources: redhat.
redhat

2467279 – (CVE-2026-42009) CVE-2026-42009 gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability

https://bugzilla.redhat.com/show_bug.cgi?id=2467279
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-42009

Vendor Advisories for CVE-2026-42009(20)

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

Patch Availability(24)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgnutls30t64 (3.8.12-2ubuntu1.1) @ resolute2026-08-25ubuntu
ubuntulibgnutlsxx28 (3.6.13-2ubuntu1.12+esm2) @ focal2026-08-25ubuntu
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatrhcos-4.19.9.6.202607151909-02026-07-22redhat
redhatgnutls-0:3.7.6-21.el9_2.72026-07-20redhat
redhatrhcos-4.21.9.6.202607011303-02026-07-07redhat
redhatrhcos-4.20.9.6.202607010620-02026-07-07redhat
redhatrhaiis/model-opt-cuda-rhel9:17829510512026-07-06redhat
redhatrhaiis/vllm-cuda-rhel9:17829510122026-07-06redhat
redhatrhaiis/vllm-rocm-rhel9:17829512442026-07-06redhat
redhatgnutls-0:3.3.29-9.el7_9.12026-07-01redhat
redhatrhcos-4.22.9.8.202606230855-02026-06-30redhat
redhatlibtasn1-0:4.13-3.el8_4.12026-06-29redhat
redhatlibtasn1-0:4.13-4.el8_8.12026-06-29redhat
redhatgnutls-0:3.8.3-4.el9_4.62026-06-29redhat
redhatlibtasn1-0:4.13-3.el8_6.22026-06-29redhat
redhatgnutls-0:3.8.3-6.el9_6.42026-06-25redhat
redhatdiscovery/discovery-ui-rhel9:17821669522026-06-24redhat
redhatrhui5/rhua-rhel9:17815257392026-06-16redhat
redhatgnutls-0:3.8.9-9.el10_0.192026-06-16redhat
redhatgnutls-0:3.8.10-4.el10_22026-05-26redhat
redhatgnutls-0:3.6.16-8.el8_10.62026-05-26redhat
redhatgnutls-0:3.8.10-4.el9_82026-05-26redhat
redhatgnutls-main-3.8.13-1.hum12026-05-02redhat

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

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
gnutls283.7.1-5 ... 3.7.1-5+deb11u9 (10 versions)3.7.1-5+deb11u10—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
gnutls283.7.9-2 ... 3.7.9-2+deb12u6 (7 versions)3.7.9-2+deb12u7—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
gnutls283.8.9-3, 3.8.9-3+deb13u1, 3.8.9-3+deb13u2, 3.8.9-3+deb13u33.8.9-3+deb13u4—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
gnutls283.8.10-1 ... 3.8.9-3 (11 versions)3.8.13-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

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 52× in last 7d / 140× 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 320 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42009?
CVE-2026-42009 is a high vulnerability published on May 18, 2026. A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This…
When was CVE-2026-42009 disclosed?
CVE-2026-42009 was first published in the National Vulnerability Database on May 18, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42009 actively exploited?
CVE-2026-42009 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 31.0% of all scored CVEs.
What is the CVSS score of CVE-2026-42009?
CVE-2026-42009 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-42009?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42009, 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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