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: 1.1%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
65th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

May 4, 2026

Last Modified

October 2, 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(29)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibgnutls30t64 (3.8.12-2ubuntu1.1) @ resolute2026-10-02ubuntu
ubuntulibgnutlsxx28 (3.4.10-4ubuntu1.9+esm3) @ xenial2026-10-02ubuntu
redhatcert-manager/cert-manager-trust-manager-rhel9:17905985932026-09-28redhat
redhatrhcos-413.92.202609080414-02026-09-17redhat
redhatrhcos-412.86.202608241157-02026-09-03redhat
redhatrhcos-417.94.202608250221-02026-09-03redhat
redhatrhcos-416.94.202608150307-02026-08-31redhat
redhatrhcos-415.92.202608180329-02026-08-31redhat
redhatrhcos-414.92.202608172040-02026-08-31redhat
redhatrhcos-418.94.202608142238-02026-08-26redhat
redhatrhcos-4.19.9.6.202608182320-02026-08-26redhat
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_6.22026-06-29redhat
redhatlibtasn1-0:4.13-3.el8_4.12026-06-29redhat
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.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.

Affected Packages

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.13-r0: fixed in 3.8.13-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.1-5 ... 3.7.1-5+deb11u9 (10 versions)
  • every version up to 3.7.1-5+deb11u10: fixed in 3.7.1-5+deb11u10
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.9-2 ... 3.7.9-2+deb12u6 (7 versions)
  • every version up to 3.7.9-2+deb12u7: fixed in 3.7.9-2+deb12u7
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.9-3, 3.8.9-3+deb13u1, 3.8.9-3+deb13u2, 3.8.9-3+deb13u3
  • every version up to 3.8.9-3+deb13u4: fixed in 3.8.9-3+deb13u4
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.10-1 ... 3.8.9-3 (11 versions)
  • every version up to 3.8.13-1: fixed in 3.8.13-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(9)

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 / 47× 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 382 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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 on May 4, 2026, with the most recent update on October 2, 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 1.1% probability of exploitation in the next 30 days (65th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33846?
CVE-2026-33846 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-33846?
A fix for CVE-2026-33846 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33846 are linked in the Vendor Advisories panel on this page.

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