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 45% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — Patch released this week
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
55%
KEV
Not listed

Published

April 30, 2026

Last Modified

September 18, 2026

Advisory Details (12)

Auto-updated Sep 15, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Serv

https://access.redhat.com/errata/RHSA-2026:30850
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:30849
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:30004
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:29197
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:26409
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:26319
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:20613
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:20612
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:20611
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13274
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(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
ubuntulibgnutls30t64 (3.8.3-1.1ubuntu3.6) @ noble2026-09-18ubuntu
ubuntulibgnutlsxx28 (3.6.13-2ubuntu1.12+esm2) @ focal2026-09-18ubuntu
redhatrhcos-413.92.202609080414-02026-09-17redhat
redhatrhcos-417.94.202608250221-02026-09-03redhat
redhatrhcos-412.86.202608241157-02026-09-03redhat
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/vllm-cuda-rhel9:17829510122026-07-06redhat
redhatrhaiis/vllm-rocm-rhel9:17829512442026-07-06redhat
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
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

(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 18× in last 7d / 107× 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 418 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 UTCVendor advisory
  4. 2026-09-18 13:23 UTCGHSA enrichment
  5. 2026-09-18 12:20 UTCEG score recompute
  6. 2026-09-18 12:20 UTCVendor advisory
  7. 2026-09-18 12:20 UTCGHSA enrichment
  8. 2026-09-17 19:30 UTCEPSS rescore
  9. 2026-09-17 19:29 UTCVendor advisory
  10. 2026-09-17 19:29 UTCGHSA enrichment
  11. 2026-09-17 18:30 UTCEG score recompute
  12. 2026-09-17 18:30 UTCVendor advisory
  13. 2026-09-17 18:30 UTCGHSA enrichment
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 03:11 UTCEPSS rescore
  17. 2026-09-13 16:47 UTCEPSS rescore
  18. 2026-09-12 15:01 UTCEPSS rescore
  19. 2026-09-11 14:53 UTCEPSS rescore
  20. 2026-09-11 09:37 UTCEPSS rescore
  21. 2026-09-10 09:34 UTCEPSS rescore
  22. 2026-09-08 22:00 UTCEPSS rescore
  23. 2026-09-07 16:01 UTCEPSS rescore
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-04 13:29 UTCVendor advisory
Show 75 more
  1. 2026-09-04 13:29 UTCGHSA enrichment
  2. 2026-09-04 12:23 UTCEG score recompute
  3. 2026-09-04 12:23 UTCVendor advisory
  4. 2026-09-04 12:23 UTCGHSA enrichment
  5. 2026-09-04 05:06 UTCEPSS rescore
  6. 2026-09-03 15:33 UTCVendor advisory
  7. 2026-09-03 15:32 UTCGHSA enrichment
  8. 2026-09-03 14:21 UTCVendor advisory
  9. 2026-09-03 14:21 UTCGHSA enrichment
  10. 2026-09-03 13:20 UTCVendor advisory
  11. 2026-09-03 13:20 UTCGHSA enrichment
  12. 2026-09-03 12:29 UTCEG score recompute
  13. 2026-09-03 12:29 UTCVendor advisory
  14. 2026-09-03 12:29 UTCGHSA enrichment
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:53 UTCEPSS rescore
  17. 2026-09-01 13:50 UTCVendor advisory
  18. 2026-09-01 13:50 UTCGHSA enrichment
  19. 2026-09-01 12:22 UTCVendor advisory
  20. 2026-09-01 12:22 UTCGHSA enrichment
  21. 2026-09-01 11:57 UTCEG score recompute
  22. 2026-09-01 11:57 UTCVendor advisory
  23. 2026-09-01 11:57 UTCGHSA enrichment
  24. 2026-09-01 04:39 UTCEPSS rescore
  25. 2026-09-01 04:39 UTCEPSS rescore
  26. 2026-08-31 16:42 UTCVendor advisory
  27. 2026-08-31 16:42 UTCGHSA enrichment
  28. 2026-08-31 14:54 UTCVendor advisory
  29. 2026-08-31 14:54 UTCGHSA enrichment
  30. 2026-08-31 13:33 UTCVendor advisory
  31. 2026-08-31 13:33 UTCGHSA enrichment
  32. 2026-08-31 12:31 UTCVendor advisory
  33. 2026-08-31 12:31 UTCGHSA enrichment
  34. 2026-08-31 03:20 UTCVendor advisory
  35. 2026-08-31 03:20 UTCGHSA enrichment
  36. 2026-08-31 02:34 UTCEG score recompute
  37. 2026-08-31 02:34 UTCVendor advisory
  38. 2026-08-31 02:34 UTCGHSA enrichment
  39. 2026-08-30 19:17 UTCEPSS rescore
  40. 2026-08-30 01:22 UTCEPSS rescore
  41. 2026-08-28 21:41 UTCEPSS rescore
  42. 2026-08-27 14:25 UTCEPSS rescore
  43. 2026-08-27 13:35 UTCVendor advisory
  44. 2026-08-27 13:35 UTCGHSA enrichment
  45. 2026-08-27 13:02 UTCVendor advisory
  46. 2026-08-27 13:02 UTCGHSA enrichment
  47. 2026-08-26 22:20 UTCVendor advisory
  48. 2026-08-26 22:20 UTCGHSA enrichment
  49. 2026-08-26 22:04 UTCVendor advisory
  50. 2026-08-26 22:04 UTCGHSA enrichment
  51. 2026-08-26 17:45 UTCVendor advisory
  52. 2026-08-26 17:45 UTCGHSA enrichment
  53. 2026-08-26 16:12 UTCEG score recompute
  54. 2026-08-26 16:12 UTCVendor advisory
  55. 2026-08-26 16:11 UTCGHSA enrichment
  56. 2026-08-26 14:46 UTCEPSS rescore
  57. 2026-08-26 13:26 UTCVendor advisory
  58. 2026-08-26 13:26 UTCGHSA enrichment
  59. 2026-08-26 12:22 UTCVendor advisory
  60. 2026-08-26 12:22 UTCGHSA enrichment
  61. 2026-08-25 16:28 UTCVendor advisory
  62. 2026-08-25 16:28 UTCGHSA enrichment
  63. 2026-08-25 16:11 UTCEG score recompute
  64. 2026-08-25 16:11 UTCVendor advisory
  65. 2026-08-25 16:11 UTCGHSA enrichment
  66. 2026-08-25 13:49 UTCEPSS rescore
  67. 2026-08-25 13:25 UTCVendor advisory
  68. 2026-08-25 13:25 UTCGHSA enrichment
  69. 2026-08-25 10:23 UTCVendor advisory
  70. 2026-08-25 10:23 UTCGHSA enrichment
  71. 2026-08-25 09:27 UTCVendor advisory
  72. 2026-08-25 09:27 UTCGHSA enrichment
  73. 2026-08-24 17:21 UTCVendor advisory
  74. 2026-08-24 17:21 UTCGHSA enrichment
  75. 2026-08-24 16:55 UTCEG score recompute

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 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-2026-33845 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 44.8% 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

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