CVE-2026-40613

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 37% of all CVEs by exploit prediction. 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, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
64%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 24, 2026

Advisory Details (1)

Auto-updated Jun 7, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64) · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
coturn4.12.0-1 ... 4.6.1-2 (7 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
coturn4.12.0-1, 4.14.0-1, 4.15.0-1, 4.6.1-1, 4.6.1-2——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
coturn4.12.0-1, 4.14.0-1, 4.15.0-1, 4.6.1-2——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
coturn4.6.1-24.12.0-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 25× 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 149 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40613?
CVE-2026-40613 is a high vulnerability published on April 21, 2026. Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8t * to uint16t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries,…
When was CVE-2026-40613 disclosed?
CVE-2026-40613 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40613 actively exploited?
CVE-2026-40613 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 35.6% of all scored CVEs.
What is the CVSS score of CVE-2026-40613?
CVE-2026-40613 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-40613?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40613, 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.

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