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% (14th 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
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity82% × 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
0.3%
EPSS %ILE
14th
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 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 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(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 114× 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 184 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

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 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 0.3% probability of exploitation in the next 30 days (14th percentile of EPSS-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?
A fix for CVE-2026-77584 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77584 are linked in the Vendor Advisories panel on this page.

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