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 13× in last 7d / 61× 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 181 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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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