CVE-2026-33845

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 47% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 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
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

April 30, 2026

Last Modified

July 20, 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(19)

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 12× in last 7d / 60× 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 180 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:18 UTCEPSS rescore
  4. 2026-07-25 14:18 UTCEPSS rescore
  5. 2026-07-24 14:17 UTCEPSS rescore
  6. 2026-07-24 14:17 UTCEPSS rescore
  7. 2026-07-23 14:18 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:09 UTCEG score recompute▲ 1.60
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 15:24 UTCEPSS rescore
  12. 2026-07-20 17:08 UTCEPSS rescore
  13. 2026-07-20 10:35 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  14. 2026-07-20 09:04 UTCOSV refresh
  15. 2026-07-19 14:31 UTCEPSS rescore
  16. 2026-07-19 02:29 UTCEPSS rescore
  17. 2026-07-18 10:04 UTCEPSS rescore
  18. 2026-07-16 17:03 UTCEPSS rescore
  19. 2026-07-16 12:08 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  20. 2026-07-15 16:57 UTCEPSS rescore
  21. 2026-07-15 16:57 UTCEPSS rescore
  22. 2026-07-15 02:25 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  23. 2026-07-15 02:00 UTCEPSS rescore
  24. 2026-07-14 12:10 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  25. 2026-07-13 22:30 UTCEPSS rescore
Show 75 more
  1. 2026-07-13 18:08 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  2. 2026-07-13 17:12 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-08 15:15 UTCEPSS rescore
  9. 2026-07-07 14:14 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-07 12:11 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  12. 2026-07-06 21:35 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  13. 2026-07-06 19:44 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  14. 2026-07-06 18:21 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  15. 2026-07-06 17:36 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  16. 2026-07-06 16:27 UTCEPSS rescore
  17. 2026-07-06 16:27 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-06 02:23 UTCEPSS rescore
  20. 2026-07-05 02:30 UTCEPSS rescore
  21. 2026-07-04 06:31 UTCEPSS rescore
  22. 2026-07-01 15:06 UTCEPSS rescore
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-29 21:26 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  25. 2026-06-29 20:57 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  26. 2026-06-29 14:06 UTCEPSS rescore
  27. 2026-06-29 14:06 UTCEPSS rescore
  28. 2026-06-29 13:24 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  29. 2026-06-29 12:02 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  30. 2026-06-29 10:04 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  31. 2026-06-29 08:47 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  32. 2026-06-28 14:07 UTCEPSS rescore
  33. 2026-06-28 14:07 UTCEPSS rescore
  34. 2026-06-28 04:56 UTCEPSS rescore
  35. 2026-06-28 04:56 UTCEPSS rescore
  36. 2026-06-27 03:08 UTCEPSS rescore
  37. 2026-06-25 13:49 UTCEPSS rescore
  38. 2026-06-25 13:49 UTCEPSS rescore
  39. 2026-06-24 14:05 UTCEPSS rescore
  40. 2026-06-24 11:53 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
  41. 2026-06-23 21:33 UTCEPSS rescore
  42. 2026-06-23 21:33 UTCEPSS rescore
  43. 2026-06-22 14:25 UTCEPSS rescore
  44. 2026-06-22 14:25 UTCEPSS rescore
  45. 2026-06-21 22:58 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  46. 2026-06-21 14:56 UTCEPSS rescore
  47. 2026-06-21 14:56 UTCEPSS rescore
  48. 2026-06-21 01:59 UTCEPSS rescore
  49. 2026-06-19 19:25 UTCEPSS rescore
  50. 2026-06-19 19:25 UTCEPSS rescore
  51. 2026-06-18 17:52 UTCEPSS rescore
  52. 2026-06-18 17:52 UTCEPSS rescore
  53. 2026-06-17 17:53 UTCEPSS rescore
  54. 2026-06-16 17:52 UTCEPSS rescore
  55. 2026-06-15 17:49 UTCEPSS rescore
  56. 2026-06-14 23:18 UTCEPSS rescore
  57. 2026-06-14 20:33 UTCVendor advisory
  58. 2026-06-14 20:33 UTCGHSA enrichment
  59. 2026-06-14 09:16 UTCVendor advisory
  60. 2026-06-14 09:16 UTCGHSA enrichment
  61. 2026-06-13 23:00 UTCEPSS rescore
  62. 2026-06-12 23:12 UTCEPSS rescore
  63. 2026-06-12 23:12 UTCEPSS rescore
  64. 2026-06-12 08:10 UTCVendor advisory
  65. 2026-06-12 08:10 UTCGHSA enrichment
  66. 2026-06-11 20:50 UTCVendor advisory
  67. 2026-06-11 20:50 UTCGHSA enrichment
  68. 2026-06-11 14:00 UTCEPSS rescore
  69. 2026-06-11 09:37 UTCVendor advisory
  70. 2026-06-11 09:37 UTCGHSA enrichment
  71. 2026-06-10 22:18 UTCEPSS rescore
  72. 2026-06-10 21:55 UTCVendor advisory
  73. 2026-06-10 21:55 UTCGHSA enrichment
  74. 2026-06-10 13:22 UTCEPSS rescore
  75. 2026-06-10 10:42 UTCVendor advisory

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 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33845 actively exploited?
CVE-2026-33845 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 47.0% of all scored CVEs.
What is the CVSS score of CVE-2026-33845?
CVE-2026-33845 has a CVSS v3 base score of 9.1 (NVD).
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

Explore the affected products and dependency analysis for CVE-2026-33845

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