CVE-2026-76886

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

C12.22 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100CISA 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
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
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
0.4%
EPSS %ILE
29th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

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

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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

August 19, 2026

Last Modified

August 28, 2026

Advisory Details (3)

Auto-updated Oct 2, 2026
Patch available.
generic

CMS MessageDigest verification dereferences missing algorithm (#21446) · Issues · Wireshark Foundation / Wireshark · GitLab

https://gitlab.com/wireshark/wireshark/-/work_items/21446
generic

Wireshark • Go Deep | Wireshark • wnpa-sec-2026-75 C12.22 protocol dissector crash

https://www.wireshark.org/security/wnpa-sec-2026-75.html
generic

EAX CMAC 16-bit length truncation can overflow heap on large C12.22 cleartext-auth payloads (#21439) · Issues · Wireshark Foundation / Wireshark · GitLab

https://gitlab.com/wireshark/wireshark/-/work_items/21439

Vendor Advisories for CVE-2026-76886(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
wireshark4.0.10-1 ... 4.6.6-2 (50 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
wireshark4.4.13-0+deb13u1 ... 4.4.9-1 (7 versions)
  • every version up to 4.4.18-0+deb13u1: fixed in 4.4.18-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
wireshark4.4.7-1 ... 4.6.6-2 (16 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 39× in last 7d / 199× 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 301 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-76886?
CVE-2026-76886 is a critical vulnerability published on August 19, 2026. C12.22 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
When was CVE-2026-76886 disclosed?
CVE-2026-76886 was first published on August 19, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76886 actively exploited?
CVE-2026-76886 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76886?
CVE-2026-76886 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-76886?
A fix for CVE-2026-76886 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-76886 are linked in the Vendor Advisories panel on this page.

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