CVE-2026-62959

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.2Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100CISA 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%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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

July 31, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Jul 31, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
githubMentions a patch (unverified)🟡 PoC Available

Pre-authentication heap memory disclosure in coturn ACME redirect (`try_acme_redirect`) · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g
github_release Patch Available

4.15.0

Patch available: coturn/coturn 4.15.0

https://github.com/coturn/coturn/releases/tag/4.15.0
github_pr Patch Available

fix: reject ACME requests via signed return

Patch available: coturn/coturn 4.15.0 (PR #1965 merged 2026-06-28)

https://github.com/coturn/coturn/pull/1965
github_commit Patch Available

commit 960835886692 (coturn/coturn)

Patch available: coturn/coturn 4.15.0 (contains commit 960835886692)

https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1 ... 4.6.1-2 (7 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1, 4.14.0-1, 4.15.0-1, 4.6.1-1, 4.6.1-2
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1, 4.14.0-1, 4.15.0-1, 4.6.1-2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1, 4.14.0-1, 4.6.1-2
  • every version up to 4.15.0-1: fixed in 4.15.0-1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 42× 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 116 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-62959?
CVE-2026-62959 is a high vulnerability published on July 31, 2026. Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose…
When was CVE-2026-62959 disclosed?
CVE-2026-62959 was first published on July 31, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62959 actively exploited?
CVE-2026-62959 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-62959?
CVE-2026-62959 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-62959?
A fix for CVE-2026-62959 is available: update to the fixed version the vendor names in its advisory.

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