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 — 4 sources updated 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: 1.1%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
65th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 18, 2026

Last Modified

October 8, 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
redhatMentions a patch (unverified)

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(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhai/base-image-neuron-rhel9:17907035422026-10-01redhat
redhatcert-manager/cert-manager-trust-manager-rhel9:17905985932026-09-28redhat
redhatrhcos-413.92.202609080414-02026-09-17redhat
redhatrhcos-417.94.202608250221-02026-09-03redhat
redhatrhcos-412.86.202608241157-02026-09-03redhat
redhatrhcos-416.94.202608150307-02026-08-31redhat
redhatrhcos-415.92.202608180329-02026-08-31redhat
redhatrhcos-414.92.202608172040-02026-08-31redhat
redhatrhcos-418.94.202608142238-02026-08-26redhat
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-4.20.9.6.202607010620-02026-07-07redhat
redhatrhcos-4.21.9.6.202607011303-02026-07-07redhat
redhatrhaiis/vllm-rocm-rhel9:17829512442026-07-06redhat
redhatrhaiis/vllm-cuda-rhel9:17829510122026-07-06redhat
redhatrhaiis/model-opt-cuda-rhel9:17829510512026-07-06redhat
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
redhatgnutls-0:3.8.9-9.el10_0.192026-06-16redhat
redhatrhui5/rhua-rhel9:17815257392026-06-16redhat
redhatgnutls-0:3.6.16-8.el8_10.62026-05-26redhat
redhatgnutls-0:3.8.10-4.el9_82026-05-26redhat
redhatgnutls-0:3.8.10-4.el10_22026-05-26redhat

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 rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.1-5 ... 3.7.1-5+deb11u9 (10 versions)
  • every version up to 3.7.1-5+deb11u10: fixed in 3.7.1-5+deb11u10
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.9-2 ... 3.7.9-2+deb12u6 (7 versions)
  • every version up to 3.7.9-2+deb12u7: fixed in 3.7.9-2+deb12u7
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.9-3, 3.8.9-3+deb13u1, 3.8.9-3+deb13u2, 3.8.9-3+deb13u3
  • every version up to 3.8.9-3+deb13u4: fixed in 3.8.9-3+deb13u4
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.10-1 ... 3.8.9-3 (11 versions)
  • every version up to 3.8.13-1: fixed in 3.8.13-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(12)

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 10× in last 7d / 49× 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 441 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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 on May 18, 2026, with the most recent update on October 8, 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 1.1% probability of exploitation in the next 30 days (65th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42009?
CVE-2026-42009 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-42009?
A fix for CVE-2026-42009 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42009 are linked in the Vendor Advisories panel on this page.

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