CVE-2026-33845

CRITICALNVD 9.17.5▼
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-04-30. NVD baseline CVSS 9.1; sources differ by 1.6.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.

CVSS v3
9.1
EG Score
7.5(medium)
EPSS
52.5%
KEV
Not listed

Published

April 30, 2026

Last Modified

July 7, 2026

Advisory Details (2)

Auto-updated Apr 30, 2026
Patch available. Sources: redhat.
redhat

2450624 – (CVE-2026-33845) CVE-2026-33845 gnutls: GnuTLS: Denial of Service via DTLS zero-length fragment

https://bugzilla.redhat.com/show_bug.cgi?id=2450624
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-33845

Vendor Advisories for CVE-2026-33845(16)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgnutls30t64 (3.8.12-2ubuntu1.1) @ resolute2026-06-14ubuntu
redhatgnutls-0:3.8.10-4.el10_22026-05-26redhat
redhatgnutls-0:3.8.10-4.el9_82026-05-26redhat
redhatgnutls-0:3.6.16-8.el8_10.62026-05-26redhat
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.

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 15× in last 7d / 64× 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 177 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:15 UTCEPSS rescore
  5. 2026-07-07 14:14 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  6. 2026-07-07 13:46 UTCEPSS rescore
  7. 2026-07-07 12:11 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  8. 2026-07-06 21:35 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  9. 2026-07-06 19:44 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  10. 2026-07-06 18:21 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  11. 2026-07-06 17:36 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 02:23 UTCEPSS rescore
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-05 02:30 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-06-30 23:22 UTCEPSS rescore
  20. 2026-06-29 21:26 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  21. 2026-06-29 20:57 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 13:24 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  25. 2026-06-29 12:02 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
Show 75 more
  1. 2026-06-29 10:04 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  2. 2026-06-29 08:47 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 14:07 UTCEPSS rescore
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-27 03:08 UTCEPSS rescore
  8. 2026-06-25 13:49 UTCEPSS rescore
  9. 2026-06-25 13:49 UTCEPSS rescore
  10. 2026-06-24 14:05 UTCEPSS rescore
  11. 2026-06-24 11:53 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  12. 2026-06-23 21:33 UTCEPSS rescore
  13. 2026-06-23 21:33 UTCEPSS rescore
  14. 2026-06-22 14:25 UTCEPSS rescore
  15. 2026-06-22 14:25 UTCEPSS rescore
  16. 2026-06-21 22:58 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  17. 2026-06-21 14:56 UTCEPSS rescore
  18. 2026-06-21 14:56 UTCEPSS rescore
  19. 2026-06-21 01:59 UTCEPSS rescore
  20. 2026-06-19 19:25 UTCEPSS rescore
  21. 2026-06-19 19:25 UTCEPSS rescore
  22. 2026-06-18 17:52 UTCEPSS rescore
  23. 2026-06-18 17:52 UTCEPSS rescore
  24. 2026-06-17 17:53 UTCEPSS rescore
  25. 2026-06-16 17:52 UTCEPSS rescore
  26. 2026-06-15 17:49 UTCEPSS rescore
  27. 2026-06-14 23:18 UTCEPSS rescore
  28. 2026-06-14 20:33 UTCEG score recompute
  29. 2026-06-14 20:33 UTCVendor advisory
  30. 2026-06-14 20:33 UTCGHSA enrichment
  31. 2026-06-14 09:16 UTCEG score recompute
  32. 2026-06-14 09:16 UTCVendor advisory
  33. 2026-06-14 09:16 UTCGHSA enrichment
  34. 2026-06-13 23:00 UTCEPSS rescore
  35. 2026-06-12 23:12 UTCEPSS rescore
  36. 2026-06-12 23:12 UTCEPSS rescore
  37. 2026-06-12 08:10 UTCEG score recompute
  38. 2026-06-12 08:10 UTCVendor advisory
  39. 2026-06-12 08:10 UTCGHSA enrichment
  40. 2026-06-11 20:50 UTCEG score recompute
  41. 2026-06-11 20:50 UTCVendor advisory
  42. 2026-06-11 20:50 UTCGHSA enrichment
  43. 2026-06-11 14:00 UTCEPSS rescore
  44. 2026-06-11 09:37 UTCEG score recompute
  45. 2026-06-11 09:37 UTCVendor advisory
  46. 2026-06-11 09:37 UTCGHSA enrichment
  47. 2026-06-10 22:18 UTCEPSS rescore
  48. 2026-06-10 21:55 UTCEG score recompute
  49. 2026-06-10 21:55 UTCVendor advisory
  50. 2026-06-10 21:55 UTCGHSA enrichment
  51. 2026-06-10 13:22 UTCEPSS rescore
  52. 2026-06-10 10:42 UTCEG score recompute
  53. 2026-06-10 10:42 UTCVendor advisory
  54. 2026-06-10 10:42 UTCGHSA enrichment
  55. 2026-06-09 23:29 UTCEG score recompute
  56. 2026-06-09 23:29 UTCVendor advisory
  57. 2026-06-09 23:29 UTCGHSA enrichment
  58. 2026-06-09 10:53 UTCEG score recompute
  59. 2026-06-09 10:53 UTCVendor advisory
  60. 2026-06-09 10:53 UTCGHSA enrichment
  61. 2026-06-08 23:40 UTCEG score recompute
  62. 2026-06-08 23:40 UTCVendor advisory
  63. 2026-06-08 23:40 UTCGHSA enrichment
  64. 2026-06-08 23:31 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  65. 2026-06-08 14:17 UTCEPSS rescore
  66. 2026-06-08 14:17 UTCEPSS rescore
  67. 2026-06-08 11:15 UTCEG score recompute
  68. 2026-06-08 11:15 UTCVendor advisory
  69. 2026-06-08 11:15 UTCGHSA enrichment
  70. 2026-06-07 23:55 UTCEG score recompute
  71. 2026-06-07 23:55 UTCVendor advisory
  72. 2026-06-07 23:55 UTCGHSA enrichment
  73. 2026-06-07 15:25 UTCEPSS rescore
  74. 2026-06-07 15:25 UTCEPSS rescore
  75. 2026-06-07 15:25 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-33845?
CVE-2026-33845 is a critical vulnerability published on April 30, 2026. A flaw in GnuTLS DTLS handshake parsing allows malformed fragments with zero length and non-zero offset, leading to an integer underflow during reassembly and resulting in an out-of-bounds read. This issue is remotely exploitable and may cause information disclosure or denial of service.
When was CVE-2026-33845 disclosed?
CVE-2026-33845 was first published in the National Vulnerability Database on April 30, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33845 actively exploited?
CVE-2026-33845 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 52.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33845?
CVE-2026-33845 has a CVSS v3 base score of 9.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.5.
How do I remediate CVE-2026-33845?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33845, 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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