CVE-2026-77587

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 86% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

August 20, 2026

Last Modified

September 16, 2026

References (1)

Vendor Advisories for CVE-2026-77587(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 rangeFixed inDependents
tor0.4.7.13-1 ... 0.4.9.9-1~bpo13+1 (47 versions)0.4.9.11-0+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
tor0.4.8.16-1 ... 0.4.9.9-1~bpo13+1 (22 versions)0.4.9.11-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
tor0.4.8.16-1 ... 0.4.9.9-1~bpo13+1 (21 versions)0.4.9.11-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 90× 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.

  1. 2026-09-19 10:12 UTCGHSA enrichment
  2. 2026-09-18 22:49 UTCEG score recompute
  3. 2026-09-18 22:49 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 11:39 UTCGHSA enrichment
  6. 2026-09-18 00:21 UTCEG score recompute
  7. 2026-09-18 00:21 UTCGHSA enrichment
  8. 2026-09-17 13:10 UTCGHSA enrichment
  9. 2026-09-17 01:27 UTCGHSA enrichment
  10. 2026-09-16 14:16 UTCEG score recompute▲ 1.60
  11. 2026-09-16 14:16 UTCGHSA enrichment
  12. 2026-09-16 14:16 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-16 06:38 UTCEG score recompute
  15. 2026-09-16 06:38 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-15 05:58 UTCEG score recompute
  18. 2026-09-15 05:58 UTCGHSA enrichment
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-14 05:17 UTCEG score recompute
  22. 2026-09-14 05:17 UTCGHSA enrichment
  23. 2026-09-13 04:37 UTCEG score recompute
  24. 2026-09-13 04:36 UTCGHSA enrichment
  25. 2026-09-12 15:02 UTCEPSS rescore
Show 65 more
  1. 2026-09-12 03:56 UTCEG score recompute
  2. 2026-09-12 03:56 UTCGHSA enrichment
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 03:15 UTCEG score recompute
  5. 2026-09-11 03:15 UTCGHSA enrichment
  6. 2026-09-10 09:35 UTCEPSS rescore
  7. 2026-09-10 02:34 UTCGHSA enrichment
  8. 2026-09-09 01:54 UTCEG score recompute
  9. 2026-09-09 01:54 UTCGHSA enrichment
  10. 2026-09-08 22:01 UTCEPSS rescore
  11. 2026-09-07 20:51 UTCEG score recompute
  12. 2026-09-07 20:51 UTCGHSA enrichment
  13. 2026-09-06 20:11 UTCEG score recompute
  14. 2026-09-06 20:11 UTCGHSA enrichment
  15. 2026-09-06 13:48 UTCEPSS rescore
  16. 2026-09-05 19:30 UTCEG score recompute
  17. 2026-09-05 19:30 UTCGHSA enrichment
  18. 2026-09-04 18:49 UTCEG score recompute
  19. 2026-09-04 18:49 UTCGHSA enrichment
  20. 2026-09-04 05:07 UTCEPSS rescore
  21. 2026-09-03 18:05 UTCGHSA enrichment
  22. 2026-09-03 05:41 UTCEG score recompute
  23. 2026-09-03 05:41 UTCGHSA enrichment
  24. 2026-09-02 14:12 UTCEPSS rescore
  25. 2026-09-02 04:51 UTCEG score recompute
  26. 2026-09-02 04:51 UTCGHSA enrichment
  27. 2026-09-01 13:54 UTCEPSS rescore
  28. 2026-09-01 04:40 UTCEPSS rescore
  29. 2026-09-01 04:40 UTCEPSS rescore
  30. 2026-09-01 04:05 UTCGHSA enrichment
  31. 2026-08-31 02:49 UTCEG score recompute
  32. 2026-08-31 02:49 UTCGHSA enrichment
  33. 2026-08-30 19:18 UTCEPSS rescore
  34. 2026-08-30 19:17 UTCEPSS rescore
  35. 2026-08-30 02:09 UTCEG score recompute
  36. 2026-08-30 02:09 UTCGHSA enrichment
  37. 2026-08-30 01:22 UTCEPSS rescore
  38. 2026-08-29 01:28 UTCEG score recompute
  39. 2026-08-29 01:28 UTCGHSA enrichment
  40. 2026-08-28 21:42 UTCEPSS rescore
  41. 2026-08-27 21:58 UTCEG score recompute
  42. 2026-08-27 21:58 UTCGHSA enrichment
  43. 2026-08-27 14:25 UTCEPSS rescore
  44. 2026-08-26 21:18 UTCEG score recompute
  45. 2026-08-26 21:18 UTCGHSA enrichment
  46. 2026-08-26 14:47 UTCEPSS rescore
  47. 2026-08-25 20:37 UTCEG score recompute
  48. 2026-08-25 20:37 UTCGHSA enrichment
  49. 2026-08-25 19:25 UTCEG score recompute
  50. 2026-08-25 19:25 UTCGHSA enrichment
  51. 2026-08-25 13:49 UTCEPSS rescore
  52. 2026-08-25 00:06 UTCEG score recompute
  53. 2026-08-25 00:06 UTCGHSA enrichment
  54. 2026-08-24 14:18 UTCEPSS rescore
  55. 2026-08-23 23:25 UTCEG score recompute
  56. 2026-08-23 23:25 UTCGHSA enrichment
  57. 2026-08-23 00:19 UTCEPSS rescore
  58. 2026-08-22 22:44 UTCEG score recompute
  59. 2026-08-22 22:44 UTCGHSA enrichment
  60. 2026-08-21 23:49 UTCEPSS rescore
  61. 2026-08-21 22:03 UTCEG score recompute
  62. 2026-08-21 22:03 UTCGHSA enrichment
  63. 2026-08-20 21:22 UTCEG score recompute
  64. 2026-08-20 20:57 UTCEG score recompute
  65. 2026-08-20 20:56 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77587?
CVE-2026-77587 is a high vulnerability published on August 20, 2026. Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recovery leg revives a conflux set whose last linked leg has already been closed. A malicious exit node could use this to crash a client. This is TROVE-2026-026.
When was CVE-2026-77587 disclosed?
CVE-2026-77587 was first published in the National Vulnerability Database on August 20, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77587 actively exploited?
CVE-2026-77587 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 85.7% of all scored CVEs.
What is the CVSS score of CVE-2026-77587?
CVE-2026-77587 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-77587?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77587, 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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