CVE-2026-42010

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 39% 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 — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

May 7, 2026

Last Modified

July 23, 2026

Advisory Details (12)

Auto-updated Aug 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 Patch Available

2467289 – (CVE-2026-42010) CVE-2026-42010 gnutls: gnutls: Authentication Bypass via NUL Character in Username

Affected: Red Hat Enterprise Linux 8

https://bugzilla.redhat.com/show_bug.cgi?id=2467289
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-42010

Vendor Advisories for CVE-2026-42010(20)

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

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgnutlsxx28 (3.4.10-4ubuntu1.9+esm3) @ xenial2026-07-26ubuntu
ubuntulibgnutls30t64 (3.8.12-2ubuntu1.1) @ resolute2026-07-26ubuntu
redhatrhcos-4.19.9.6.202607151909-02026-07-22redhat
redhatgnutls-0:3.7.6-21.el9_2.72026-07-20redhat
redhatrhcos-4.20.9.6.202607010620-02026-07-07redhat
redhatrhcos-4.22.9.8.202606301732-02026-07-07redhat
redhatrhcos-4.21.9.6.202607011303-02026-07-07redhat
redhatrhaiis/model-opt-cuda-rhel9:17829510512026-07-06redhat
redhatrhaiis/vllm-cuda-rhel9:17829510122026-07-06redhat
redhatrhaiis/vllm-rocm-rhel9:17829512442026-07-06redhat
redhatlibtasn1-0:4.13-3.el8_4.12026-06-29redhat
redhatlibtasn1-0:4.13-4.el8_8.12026-06-29redhat
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
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-0:3.6.16-8.el8_10.62026-05-26redhat
redhatgnutls-0:3.8.10-4.el9_82026-05-26redhat
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(2)

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

Additional Vendor Advisories

(3)

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 23× in last 7d / 149× 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 331 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42010?
CVE-2026-42010 is a critical vulnerability published on May 7, 2026. A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass.…
When was CVE-2026-42010 disclosed?
CVE-2026-42010 was first published in the National Vulnerability Database on May 7, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42010 actively exploited?
CVE-2026-42010 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 38.3% of all scored CVEs.
What is the CVSS score of CVE-2026-42010?
CVE-2026-42010 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-42010?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42010, 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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