CVE-2026-77642

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.4% (26th 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 week
9.3EG
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: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or detached signature with unexpected signature digest type. Impact is minor for most Tor roles, but potentially major for directory authorities. This is TROVE-2026-019.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
42
EG Risk 42/100CISA 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
Severity93% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
26th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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

August 20, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Oct 3, 2026
Patch available.
generic

Sign in · GitLab

https://gitlab.torproject.org/tpo/core/tor/-/raw/tor-0.4.9.9/ChangeLog

Vendor Advisories for CVE-2026-77642(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
tor0.4.7.13-1 ... 0.4.9.9-1~bpo13+1 (46 versions)
  • every version up to 0.4.9.9-1: fixed in 0.4.9.9-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
tor0.4.8.16-1 ... 0.4.9.9-1~bpo13+1 (22 versions)
  • every version up to 0.4.9.11-0+deb13u1: fixed in 0.4.9.11-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
tor0.4.8.16-1 ... 0.4.9.9-1~bpo13+1 (19 versions)
  • every version up to 0.4.9.9-1: fixed in 0.4.9.9-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 42× 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 262 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-77642?
CVE-2026-77642 is a critical vulnerability published on August 20, 2026. tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or detached signature with unexpected signature digest type. Impact is minor for most Tor roles, but potentially major for directory authorities. This is TROVE-2026-019.
When was CVE-2026-77642 disclosed?
CVE-2026-77642 was first published on August 20, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77642 actively exploited?
CVE-2026-77642 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77642?
CVE-2026-77642 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-77642?
A fix for CVE-2026-77642 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77642 are linked in the Vendor Advisories panel on this page.

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