CVE-2025-9820

MEDIUMPre-NVD 4.04.0—
EchelonGraph scoreMEDIUM confidence

Score 4.0 from GitHub Security Advisory published 2026-01-26. a secondary CVSS source baseline 4.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
4.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.0Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.

CVSS v3
4.0
EG Score
4.0(medium)
EG Risk
18(Track)
EG Risk 18/100SSVC: 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
Severity40% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

January 26, 2026

Last Modified

August 21, 2026

Advisory Details (10)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2025-9820
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:7477
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:7329
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:5606
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:5585
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:4943
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:4655
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:4188
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:3477
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13812

Vendor Advisories for CVE-2025-9820(9)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgnutls30t64 (3.8.9-3ubuntu2.1) @ questing2026-08-21ubuntu
ubuntulibgnutlsxx28 (3.6.13-2ubuntu1.12+esm2) @ focal2026-08-21ubuntu
redhatrhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.17773257082026-05-05redhat
redhatgnutls-main-3.8.12-1.1.hum12026-04-10redhat
redhatdiscovery/discovery-ui-rhel9:17756759222026-04-09redhat
redhatgnutls-0:3.6.16-8.el8_10.52026-03-24redhat
redhatrhceph/rhceph-8-rhel9:17740028672026-03-24redhat
redhatrhui5/rhua-rhel9:17736701372026-03-18redhat
redhatinsights-proxy/insights-proxy-container-rhel9:17736855092026-03-16redhat
redhatgnutls-0:3.8.3-10.el9_72026-03-10redhat
redhatgnutls-0:3.8.10-3.el10_12026-03-02redhat

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—3.8.12-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.12-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.12-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.11-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
gnutls—3.8.11-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
gnutls283.7.1-5 ... 3.7.1-5+deb11u8 (9 versions)3.7.1-5+deb11u9—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
gnutls283.7.9-2 ... 3.7.9-2+deb12u5 (6 versions)3.7.9-2+deb12u6—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
gnutls283.8.9-33.8.9-3+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
gnutls283.8.10-1 ... 3.8.9-3 (6 versions)3.8.11-3—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 17× in last 7d / 57× 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 164 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-9820?
CVE-2025-9820 is a medium vulnerability published on January 26, 2026. A flaw was found in the GnuTLS library, specifically in the gnutlspkcs11token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the…
When was CVE-2025-9820 disclosed?
CVE-2025-9820 was first published in the National Vulnerability Database on January 26, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-9820 actively exploited?
CVE-2025-9820 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.4% of all scored CVEs.
What is the CVSS score of CVE-2025-9820?
CVE-2025-9820 has a CVSS v3 base score of 4.0 (NVD).
How do I remediate CVE-2025-9820?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-9820, 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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