CVE-2026-77584

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 92% 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
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

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

Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the same circuit, attaching an exit stream that would later end up orphan leaving a dangling circuit back-pointer and a use-after-free (UAF) when the circuit is freed. This is TROVE-2026-025.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

August 20, 2026

Last Modified

September 16, 2026

References (1)

Vendor Advisories for CVE-2026-77584(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(1)

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

Data Freshness Timeline

(refreshed 30× in last 7d / 124× 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 124 total refreshes for this CVE.

  1. 2026-09-18 21:56 UTCEG score recompute
  2. 2026-09-18 21:56 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 11:02 UTCGHSA enrichment
  5. 2026-09-18 00:08 UTCEG score recompute
  6. 2026-09-18 00:08 UTCGHSA enrichment
  7. 2026-09-17 12:04 UTCGHSA enrichment
  8. 2026-09-17 01:10 UTCGHSA enrichment
  9. 2026-09-16 14:16 UTCEG score recompute▲ 1.20
  10. 2026-09-16 14:16 UTCGHSA enrichment
  11. 2026-09-16 14:16 UTCNVD updateCVSS v3 → 8.2
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 10:46 UTCEG score recompute
  14. 2026-09-16 10:46 UTCGHSA enrichment
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 23:39 UTCGHSA enrichment
  17. 2026-09-15 12:25 UTCEG score recompute
  18. 2026-09-15 12:25 UTCGHSA enrichment
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-15 03:12 UTCEPSS rescore
  21. 2026-09-15 01:29 UTCGHSA enrichment
  22. 2026-09-14 14:35 UTCGHSA enrichment
  23. 2026-09-14 03:39 UTCEG score recompute
  24. 2026-09-14 03:39 UTCGHSA enrichment
  25. 2026-09-13 16:45 UTCGHSA enrichment
Show 75 more
  1. 2026-09-13 05:50 UTCGHSA enrichment
  2. 2026-09-12 18:55 UTCEG score recompute
  3. 2026-09-12 18:55 UTCGHSA enrichment
  4. 2026-09-12 15:02 UTCEPSS rescore
  5. 2026-09-12 08:00 UTCGHSA enrichment
  6. 2026-09-11 21:05 UTCEG score recompute
  7. 2026-09-11 21:05 UTCGHSA enrichment
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 10:11 UTCEG score recompute
  10. 2026-09-11 10:11 UTCGHSA enrichment
  11. 2026-09-10 23:14 UTCGHSA enrichment
  12. 2026-09-10 12:14 UTCEG score recompute
  13. 2026-09-10 12:14 UTCGHSA enrichment
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-10 00:48 UTCGHSA enrichment
  16. 2026-09-09 13:04 UTCGHSA enrichment
  17. 2026-09-09 01:54 UTCEG score recompute
  18. 2026-09-09 01:54 UTCGHSA enrichment
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-08 07:40 UTCGHSA enrichment
  21. 2026-09-07 20:45 UTCEG score recompute
  22. 2026-09-07 20:45 UTCGHSA enrichment
  23. 2026-09-07 09:50 UTCGHSA enrichment
  24. 2026-09-06 22:52 UTCEG score recompute
  25. 2026-09-06 22:52 UTCGHSA enrichment
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-06 11:55 UTCGHSA enrichment
  28. 2026-09-06 01:00 UTCEG score recompute
  29. 2026-09-06 01:00 UTCGHSA enrichment
  30. 2026-09-05 13:56 UTCGHSA enrichment
  31. 2026-09-05 02:57 UTCGHSA enrichment
  32. 2026-09-04 16:00 UTCEG score recompute
  33. 2026-09-04 16:00 UTCGHSA enrichment
  34. 2026-09-04 05:07 UTCEPSS rescore
  35. 2026-09-04 05:05 UTCGHSA enrichment
  36. 2026-09-03 18:05 UTCGHSA enrichment
  37. 2026-09-03 13:59 UTCGHSA enrichment
  38. 2026-09-03 03:00 UTCGHSA enrichment
  39. 2026-09-02 16:05 UTCEG score recompute
  40. 2026-09-02 16:05 UTCGHSA enrichment
  41. 2026-09-02 14:12 UTCEPSS rescore
  42. 2026-09-02 04:36 UTCGHSA enrichment
  43. 2026-09-01 17:33 UTCEG score recompute
  44. 2026-09-01 17:32 UTCGHSA enrichment
  45. 2026-09-01 13:54 UTCEPSS rescore
  46. 2026-09-01 06:35 UTCEG score recompute
  47. 2026-09-01 06:35 UTCGHSA enrichment
  48. 2026-09-01 04:40 UTCEPSS rescore
  49. 2026-09-01 04:40 UTCEPSS rescore
  50. 2026-08-31 19:40 UTCGHSA enrichment
  51. 2026-08-31 08:45 UTCGHSA enrichment
  52. 2026-08-30 21:26 UTCEG score recompute
  53. 2026-08-30 21:26 UTCGHSA enrichment
  54. 2026-08-30 19:18 UTCEPSS rescore
  55. 2026-08-30 19:17 UTCEPSS rescore
  56. 2026-08-30 10:32 UTCEG score recompute
  57. 2026-08-30 10:31 UTCGHSA enrichment
  58. 2026-08-30 01:22 UTCEPSS rescore
  59. 2026-08-29 23:36 UTCGHSA enrichment
  60. 2026-08-29 12:41 UTCGHSA enrichment
  61. 2026-08-29 01:28 UTCEG score recompute
  62. 2026-08-29 01:28 UTCGHSA enrichment
  63. 2026-08-28 21:42 UTCEPSS rescore
  64. 2026-08-28 14:15 UTCGHSA enrichment
  65. 2026-08-28 03:20 UTCGHSA enrichment
  66. 2026-08-27 16:21 UTCEG score recompute
  67. 2026-08-27 16:21 UTCGHSA enrichment
  68. 2026-08-27 14:25 UTCEPSS rescore
  69. 2026-08-27 05:23 UTCGHSA enrichment
  70. 2026-08-26 18:26 UTCEG score recompute
  71. 2026-08-26 18:26 UTCGHSA enrichment
  72. 2026-08-26 14:47 UTCEPSS rescore
  73. 2026-08-26 07:31 UTCGHSA enrichment
  74. 2026-08-25 20:37 UTCEG score recompute
  75. 2026-08-25 20:37 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-77584?
CVE-2026-77584 is a high vulnerability published on August 20, 2026. Tor before 0.4.9.10 did not reject a CONFLUXLINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAYCOMMANDBEGIN before the CONFLUXLINK on the same circuit, attaching an exit stream that would later end up orphan leaving a dangling circuit…
When was CVE-2026-77584 disclosed?
CVE-2026-77584 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-2026-77584 actively exploited?
CVE-2026-77584 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 92.4% of all scored CVEs.
What is the CVSS score of CVE-2026-77584?
CVE-2026-77584 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-77584?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77584, 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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