CVE-2026-77587

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4% (32nd 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
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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

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
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100CISA 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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 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 rangeFix by version rangeDependents
tor0.4.7.13-1 ... 0.4.9.9-1~bpo13+1 (47 versions)
  • every version up to 0.4.9.11-0+deb12u1: fixed in 0.4.9.11-0+deb12u1
—
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 (21 versions)
  • every version up to 0.4.9.11-1: fixed in 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 / 99× 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 147 total refreshes for this CVE.

  1. 2026-10-05 08:02 UTCEG score recompute
  2. 2026-10-05 08:02 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 20:51 UTCGHSA enrichment
  5. 2026-10-04 06:34 UTCGHSA enrichment
  6. 2026-10-03 19:24 UTCEG score recompute
  7. 2026-10-03 19:24 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 07:02 UTCGHSA enrichment
  10. 2026-10-02 19:49 UTCEG score recompute
  11. 2026-10-02 19:49 UTCGHSA enrichment
  12. 2026-10-02 08:38 UTCGHSA enrichment
  13. 2026-10-01 21:28 UTCEG score recompute
  14. 2026-10-01 21:28 UTCGHSA enrichment
  15. 2026-10-01 19:50 UTCEPSS rescore
  16. 2026-10-01 07:41 UTCGHSA enrichment
  17. 2026-09-30 20:31 UTCEG score recompute
  18. 2026-09-30 20:31 UTCGHSA enrichment
  19. 2026-09-30 08:11 UTCEG score recompute
  20. 2026-09-30 08:10 UTCGHSA enrichment
  21. 2026-09-29 15:24 UTCEPSS rescore
  22. 2026-09-29 00:28 UTCEG score recompute
  23. 2026-09-29 00:28 UTCGHSA enrichment
  24. 2026-09-28 13:52 UTCEPSS rescore
  25. 2026-09-28 13:13 UTCGHSA enrichment
Show 75 more
  1. 2026-09-28 02:03 UTCGHSA enrichment
  2. 2026-09-27 14:52 UTCEG score recompute
  3. 2026-09-27 14:52 UTCGHSA enrichment
  4. 2026-09-27 13:48 UTCEPSS rescore
  5. 2026-09-27 02:55 UTCEG score recompute
  6. 2026-09-27 02:55 UTCGHSA enrichment
  7. 2026-09-26 15:59 UTCEPSS rescore
  8. 2026-09-26 00:28 UTCEPSS rescore
  9. 2026-09-25 17:22 UTCGHSA enrichment
  10. 2026-09-25 04:06 UTCGHSA enrichment
  11. 2026-09-24 16:55 UTCEG score recompute
  12. 2026-09-24 16:55 UTCGHSA enrichment
  13. 2026-09-24 14:04 UTCEPSS rescore
  14. 2026-09-24 05:27 UTCGHSA enrichment
  15. 2026-09-23 18:17 UTCEG score recompute
  16. 2026-09-23 18:17 UTCGHSA enrichment
  17. 2026-09-23 17:54 UTCEPSS rescore
  18. 2026-09-23 06:56 UTCGHSA enrichment
  19. 2026-09-22 19:45 UTCEG score recompute
  20. 2026-09-22 19:45 UTCGHSA enrichment
  21. 2026-09-22 16:01 UTCEPSS rescore
  22. 2026-09-22 06:11 UTCEG score recompute
  23. 2026-09-22 06:11 UTCGHSA enrichment
  24. 2026-09-21 21:09 UTCEPSS rescore
  25. 2026-09-21 19:00 UTCGHSA enrichment
  26. 2026-09-21 07:49 UTCEG score recompute
  27. 2026-09-21 07:49 UTCGHSA enrichment
  28. 2026-09-20 20:16 UTCEPSS rescore
  29. 2026-09-20 20:10 UTCGHSA enrichment
  30. 2026-09-20 08:59 UTCGHSA enrichment
  31. 2026-09-19 21:22 UTCEG score recompute
  32. 2026-09-19 21:22 UTCGHSA enrichment
  33. 2026-09-19 10:12 UTCGHSA enrichment
  34. 2026-09-18 22:49 UTCEG score recompute
  35. 2026-09-18 22:49 UTCGHSA enrichment
  36. 2026-09-18 19:28 UTCEPSS rescore
  37. 2026-09-18 11:39 UTCGHSA enrichment
  38. 2026-09-18 00:21 UTCEG score recompute
  39. 2026-09-18 00:21 UTCGHSA enrichment
  40. 2026-09-17 13:10 UTCGHSA enrichment
  41. 2026-09-17 01:27 UTCGHSA enrichment
  42. 2026-09-16 14:16 UTCEG score recompute▲ 1.60
  43. 2026-09-16 14:16 UTCGHSA enrichment
  44. 2026-09-16 14:16 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  45. 2026-09-16 14:08 UTCEPSS rescore
  46. 2026-09-16 06:38 UTCEG score recompute
  47. 2026-09-16 06:38 UTCGHSA enrichment
  48. 2026-09-16 05:15 UTCEPSS rescore
  49. 2026-09-15 05:58 UTCEG score recompute
  50. 2026-09-15 05:58 UTCGHSA enrichment
  51. 2026-09-15 03:12 UTCEPSS rescore
  52. 2026-09-15 03:12 UTCEPSS rescore
  53. 2026-09-14 05:17 UTCEG score recompute
  54. 2026-09-14 05:17 UTCGHSA enrichment
  55. 2026-09-13 04:37 UTCEG score recompute
  56. 2026-09-13 04:36 UTCGHSA enrichment
  57. 2026-09-12 15:02 UTCEPSS rescore
  58. 2026-09-12 03:56 UTCEG score recompute
  59. 2026-09-12 03:56 UTCGHSA enrichment
  60. 2026-09-11 14:53 UTCEPSS rescore
  61. 2026-09-11 03:15 UTCEG score recompute
  62. 2026-09-11 03:15 UTCGHSA enrichment
  63. 2026-09-10 09:35 UTCEPSS rescore
  64. 2026-09-10 02:34 UTCGHSA enrichment
  65. 2026-09-09 01:54 UTCEG score recompute
  66. 2026-09-09 01:54 UTCGHSA enrichment
  67. 2026-09-08 22:01 UTCEPSS rescore
  68. 2026-09-07 20:51 UTCEG score recompute
  69. 2026-09-07 20:51 UTCGHSA enrichment
  70. 2026-09-06 20:11 UTCEG score recompute
  71. 2026-09-06 20:11 UTCGHSA enrichment
  72. 2026-09-06 13:48 UTCEPSS rescore
  73. 2026-09-05 19:30 UTCEG score recompute
  74. 2026-09-05 19:30 UTCGHSA enrichment
  75. 2026-09-04 18:49 UTCEG score recompute

Related CVEs(same product + 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 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 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-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?
No fix for CVE-2026-77587 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-77587 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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