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
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%CVSS: 7.5Exploit: None knownExposed: 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)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
67%
KEV
Not listed

Published

May 4, 2026

Last Modified

July 20, 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(19)

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

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatgnutls-0:3.7.6-21.el9_2.72026-07-20redhat
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
redhatgnutls-0:3.8.3-4.el9_4.62026-06-29redhat
redhatlibtasn1-0:4.13-3.el8_4.12026-06-29redhat
redhatlibtasn1-0:4.13-4.el8_8.12026-06-29redhat
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
ubuntulibgnutlsxx28 (3.7.3-4ubuntu1.9) @ jammy2026-06-14ubuntu
redhatgnutls-0:3.8.10-4.el9_82026-05-26redhat
redhatgnutls-0:3.8.10-4.el10_22026-05-26redhat
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.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.13-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
gnutls283.7.1-5 ... 3.7.1-5+deb11u9 (10 versions)3.7.1-5+deb11u10—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
gnutls283.7.9-2 ... 3.7.9-2+deb12u6 (7 versions)3.7.9-2+deb12u7—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
gnutls283.8.9-3, 3.8.9-3+deb13u1, 3.8.9-3+deb13u2, 3.8.9-3+deb13u33.8.9-3+deb13u4—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
gnutls283.8.10-1 ... 3.8.9-3 (11 versions)3.8.13-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 16× in last 7d / 89× 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 232 total refreshes for this CVE.

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

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 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33846 actively exploited?
CVE-2026-33846 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 32.6% of all scored CVEs.
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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-33846

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