CVE-2026-33846

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-04. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in merge_handshake_packet() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the message_length field remains consistent across all fragments of the same logical message. An attacker can exploit this by sending crafted DTLS fragments with conflicting message_length values, causing the implementation to allocate a buffer based on a smaller initial fragment and subsequently write beyond its bounds using larger, inconsistent fragments. Because the merge operation does not enforce proper bounds checking against the allocated buffer size, this results in an out-of-bounds write on the heap. The vulnerability is remotely exploitable without authentication via the DTLS handshake path and can lead to application crashes or potential memory corruption.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
66.2%
KEV
Not listed

Published

May 4, 2026

Last Modified

July 6, 2026

Advisory Details (2)

Auto-updated May 4, 2026
Patch available. Sources: redhat.
redhat

2450625 – (CVE-2026-33846) CVE-2026-33846 gnutls: GnuTLS: Denial of Service via heap buffer overflow in DTLS handshake fragment reassembly

https://bugzilla.redhat.com/show_bug.cgi?id=2450625
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-33846

Vendor Advisories for CVE-2026-33846(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
ubuntulibgnutlsxx28 (3.7.3-4ubuntu1.9) @ jammy2026-06-14ubuntu
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 8× in last 7d / 78× 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 152 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-33846?
CVE-2026-33846 is a high vulnerability published on May 4, 2026. A heap buffer overflow vulnerability exists in the DTLS handshake fragment reassembly logic of GnuTLS. The issue arises in mergehandshakepacket() where incoming handshake fragments are matched and merged based solely on handshake type, without validating that the messagelength field remains…
When was CVE-2026-33846 disclosed?
CVE-2026-33846 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33846 actively exploited?
CVE-2026-33846 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 66.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33846?
CVE-2026-33846 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-33846?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33846, 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.

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