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 — Patch released 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
68%
KEV
Not listed

Published

May 4, 2026

Last Modified

September 18, 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(20)

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

Patch Availability(28)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgnutlsxx28 (3.4.10-4ubuntu1.9+esm3) @ xenial2026-09-18ubuntu
ubuntulibgnutls30t64 (3.8.12-2ubuntu1.1) @ resolute2026-09-18ubuntu
redhatrhcos-413.92.202609080414-02026-09-17redhat
redhatrhcos-417.94.202608250221-02026-09-03redhat
redhatrhcos-412.86.202608241157-02026-09-03redhat
redhatrhcos-414.92.202608172040-02026-08-31redhat
redhatrhcos-416.94.202608150307-02026-08-31redhat
redhatrhcos-415.92.202608180329-02026-08-31redhat
redhatrhcos-4.19.9.6.202608182320-02026-08-26redhat
redhatrhcos-418.94.202608142238-02026-08-26redhat
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatgnutls-0:3.7.6-21.el9_2.72026-07-20redhat
redhatrhaiis/model-opt-cuda-rhel9:17829510512026-07-06redhat
redhatrhaiis/vllm-cuda-rhel9:17829510122026-07-06redhat
redhatrhaiis/vllm-rocm-rhel9:17829512442026-07-06redhat
redhatgnutls-0:3.3.29-9.el7_9.12026-07-01redhat
redhatgnutls-0:3.8.3-4.el9_4.62026-06-29redhat
redhatlibtasn1-0:4.13-4.el8_8.12026-06-29redhat
redhatlibtasn1-0:4.13-3.el8_4.12026-06-29redhat
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
redhatrhui5/rhua-rhel9:17815257392026-06-16redhat
redhatgnutls-0:3.8.9-9.el10_0.192026-06-16redhat
redhatgnutls-0:3.8.10-4.el9_82026-05-26redhat
redhatgnutls-0:3.6.16-8.el8_10.62026-05-26redhat
redhatgnutls-0:3.8.10-4.el10_22026-05-26redhat
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

(7)

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 20× in last 7d / 131× 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 361 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 13:23 UTCEG score recompute
  4. 2026-09-18 13:23 UTCVendor advisory
  5. 2026-09-18 13:23 UTCGHSA enrichment
  6. 2026-09-18 12:20 UTCEG score recompute
  7. 2026-09-18 12:20 UTCVendor advisory
  8. 2026-09-18 12:20 UTCGHSA enrichment
  9. 2026-09-17 19:30 UTCEPSS rescore
  10. 2026-09-17 19:29 UTCEG score recompute
  11. 2026-09-17 19:29 UTCVendor advisory
  12. 2026-09-17 19:29 UTCGHSA enrichment
  13. 2026-09-17 18:30 UTCEG score recompute
  14. 2026-09-17 18:30 UTCVendor advisory
  15. 2026-09-17 18:30 UTCGHSA enrichment
  16. 2026-09-16 14:08 UTCEPSS rescore
  17. 2026-09-16 05:15 UTCEPSS rescore
  18. 2026-09-15 03:11 UTCEPSS rescore
  19. 2026-09-13 16:47 UTCEPSS rescore
  20. 2026-09-12 15:01 UTCEPSS rescore
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 09:37 UTCEPSS rescore
  23. 2026-09-10 09:34 UTCEPSS rescore
  24. 2026-09-08 22:00 UTCEPSS rescore
  25. 2026-09-07 16:01 UTCEPSS rescore
Show 75 more
  1. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-04 13:29 UTCEG score recompute
  3. 2026-09-04 13:29 UTCVendor advisory
  4. 2026-09-04 13:29 UTCGHSA enrichment
  5. 2026-09-04 12:23 UTCEG score recompute
  6. 2026-09-04 12:23 UTCVendor advisory
  7. 2026-09-04 12:23 UTCGHSA enrichment
  8. 2026-09-04 05:06 UTCEPSS rescore
  9. 2026-09-03 15:32 UTCEG score recompute
  10. 2026-09-03 15:32 UTCVendor advisory
  11. 2026-09-03 15:32 UTCGHSA enrichment
  12. 2026-09-03 14:21 UTCEG score recompute
  13. 2026-09-03 14:21 UTCVendor advisory
  14. 2026-09-03 14:21 UTCGHSA enrichment
  15. 2026-09-03 13:20 UTCEG score recompute
  16. 2026-09-03 13:20 UTCVendor advisory
  17. 2026-09-03 13:20 UTCGHSA enrichment
  18. 2026-09-03 12:29 UTCEG score recompute
  19. 2026-09-03 12:29 UTCVendor advisory
  20. 2026-09-03 12:29 UTCGHSA enrichment
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-01 13:53 UTCEPSS rescore
  23. 2026-09-01 13:48 UTCEG score recompute
  24. 2026-09-01 13:48 UTCVendor advisory
  25. 2026-09-01 13:48 UTCGHSA enrichment
  26. 2026-09-01 12:22 UTCVendor advisory
  27. 2026-09-01 12:22 UTCGHSA enrichment
  28. 2026-09-01 11:57 UTCEG score recompute
  29. 2026-09-01 11:57 UTCVendor advisory
  30. 2026-09-01 11:57 UTCGHSA enrichment
  31. 2026-09-01 04:39 UTCEPSS rescore
  32. 2026-09-01 04:39 UTCEPSS rescore
  33. 2026-08-31 16:42 UTCEG score recompute
  34. 2026-08-31 16:42 UTCVendor advisory
  35. 2026-08-31 16:42 UTCGHSA enrichment
  36. 2026-08-31 14:54 UTCEG score recompute
  37. 2026-08-31 14:54 UTCVendor advisory
  38. 2026-08-31 14:54 UTCGHSA enrichment
  39. 2026-08-31 13:33 UTCEG score recompute
  40. 2026-08-31 13:33 UTCVendor advisory
  41. 2026-08-31 13:33 UTCGHSA enrichment
  42. 2026-08-31 12:31 UTCEG score recompute
  43. 2026-08-31 12:31 UTCVendor advisory
  44. 2026-08-31 12:31 UTCGHSA enrichment
  45. 2026-08-31 03:20 UTCEG score recompute
  46. 2026-08-31 03:20 UTCVendor advisory
  47. 2026-08-31 03:20 UTCGHSA enrichment
  48. 2026-08-31 02:34 UTCEG score recompute
  49. 2026-08-31 02:34 UTCVendor advisory
  50. 2026-08-31 02:34 UTCGHSA enrichment
  51. 2026-08-30 19:17 UTCEPSS rescore
  52. 2026-08-30 01:22 UTCEPSS rescore
  53. 2026-08-28 21:41 UTCEPSS rescore
  54. 2026-08-27 14:25 UTCEPSS rescore
  55. 2026-08-27 13:35 UTCEG score recompute
  56. 2026-08-27 13:35 UTCVendor advisory
  57. 2026-08-27 13:35 UTCGHSA enrichment
  58. 2026-08-27 13:02 UTCEG score recompute
  59. 2026-08-27 13:02 UTCVendor advisory
  60. 2026-08-27 13:02 UTCGHSA enrichment
  61. 2026-08-26 22:20 UTCEG score recompute
  62. 2026-08-26 22:20 UTCVendor advisory
  63. 2026-08-26 22:20 UTCGHSA enrichment
  64. 2026-08-26 22:04 UTCEG score recompute
  65. 2026-08-26 22:04 UTCVendor advisory
  66. 2026-08-26 22:04 UTCGHSA enrichment
  67. 2026-08-26 17:45 UTCVendor advisory
  68. 2026-08-26 17:45 UTCGHSA enrichment
  69. 2026-08-26 16:12 UTCEG score recompute
  70. 2026-08-26 16:12 UTCVendor advisory
  71. 2026-08-26 16:11 UTCGHSA enrichment
  72. 2026-08-26 14:46 UTCEPSS rescore
  73. 2026-08-26 13:26 UTCVendor advisory
  74. 2026-08-26 13:26 UTCGHSA enrichment
  75. 2026-08-26 12:22 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 September 18, 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 31.7% 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

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