CVE-2026-33845

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.9% (58th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated 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: 0.9%CVSS: 9.1Exploit: None knownExposed services: Not assessed

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
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100CISA 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
Severity91% × 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
0.9%
EPSS %ILE
58th
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

April 30, 2026

Last Modified

October 8, 2026

Advisory Details (12)

Auto-updated Sep 15, 2026
Patch available. Sources: redhat.
redhatMentions a patch (unverified)

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
redhatMentions a patch (unverified)

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
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:30004
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:29197
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:26409
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:26319
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:20613
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:20612
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:20611
redhatMentions a patch (unverified)
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
redhatMentions a patch (unverified)

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(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibgnutls30t64 (3.8.12-2ubuntu1.1) @ resolute2026-10-08ubuntu
ubuntulibgnutlsxx28 (3.4.10-4ubuntu1.9+esm3) @ xenial2026-10-08ubuntu
redhatrhai/base-image-neuron-rhel9:17907035422026-10-01redhat
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-415.92.202608180329-02026-08-31redhat
redhatrhcos-416.94.202608150307-02026-08-31redhat
redhatrhcos-414.92.202608172040-02026-08-31redhat
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
redhatlibtasn1-0:4.13-4.el8_8.12026-06-29redhat
redhatlibtasn1-0:4.13-3.el8_4.12026-06-29redhat
redhatgnutls-0:3.8.3-4.el9_4.62026-06-29redhat
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 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 9× 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 445 total refreshes for this CVE.

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

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

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 on April 30, 2026, with the most recent update on October 8, 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 0.9% probability of exploitation in the next 30 days (58th percentile of EPSS-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?
A fix for CVE-2026-33845 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33845 are linked in the Vendor Advisories panel on this page.

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