CVE-2026-68555

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (43rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Coturn is a free open source implementation of TURN and STUN Server. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobile_begin_transition() in src/server/ns_turn_server.c disarms each new session's allocation timeout and overwrites the allocation's single mobile_pending_resume link, leaving earlier pending sessions unreachable by the cleanup path, while copy_auth_parameters() ignores inc_quota() failure. The attacker can therefore retain unbounded server-side sessions and exhaust process memory even when --user-quota=1 is configured. This issue is fixed in version 4.16.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

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 (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 19, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

4.16.0

Patch available: coturn/coturn 4.16.0

https://github.com/coturn/coturn/releases/tag/4.16.0
GitHub commit Patch Available

commit a97f1924bb43 (coturn/coturn)

Patch available: coturn/coturn docker/4.16.0-r0 (contains commit a97f1924bb43)

https://github.com/coturn/coturn/commit/a97f1924bb435bec49d6d91ae01fa2487c2e1bf7
GitHub advisoryMentions a patch (unverified)

coturn: Chained mobility resumes allow authenticated remote memory exhaustion · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-hpq3-g7x4-h7xx

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
coturn4.12.0-1 ... 4.6.1-2 (6 versions)
  • 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, 4.18.0-1, 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, 4.15.0-1, 4.6.1-2
  • every version up to 4.18.0-1: fixed in 4.18.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 49× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-12 15:45 UTCEG score recompute
  4. 2026-10-11 19:30 UTCEG score recompute
  5. 2026-10-11 16:45 UTCEG score recompute
  6. 2026-10-11 14:06 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-08 06:22 UTCEG score recompute
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-07 06:47 UTCEG score recompute
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-06 07:54 UTCEG score recompute
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-10-05 05:07 UTCEG score recompute
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-10-04 05:44 UTCEG score recompute
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-03 06:52 UTCEG score recompute
  22. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-02 06:51 UTCEG score recompute
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-10-01 07:27 UTCEG score recompute
Show 69 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-09-30 08:35 UTCEG score recompute
  3. 2026-09-29 02:09 UTCEG score recompute
  4. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-09-28 03:17 UTCEG score recompute
  6. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-09-27 04:24 UTCEG score recompute
  8. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-09-25 04:34 UTCEG score recompute
  10. 2026-09-24 05:42 UTCEG score recompute
  11. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-09-23 06:50 UTCEG score recompute
  13. 2026-09-22 07:58 UTCEG score recompute
  14. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  15. 2026-09-21 09:05 UTCEG score recompute
  16. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-09-20 10:13 UTCEG score recompute
  18. 2026-09-19 11:20 UTCEG score recompute
  19. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  20. 2026-09-18 12:28 UTCEG score recompute
  21. 2026-09-16 14:43 UTCEG score recompute
  22. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  24. 2026-09-15 15:50 UTCEG score recompute
  25. 2026-09-13 18:05 UTCEG score recompute
  26. 2026-09-12 19:11 UTCEG score recompute
  27. 2026-09-11 20:19 UTCEG score recompute
  28. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  29. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  30. 2026-09-10 21:26 UTCEG score recompute
  31. 2026-09-09 02:15 UTCEG score recompute
  32. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-09-08 01:39 UTCEG score recompute
  34. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-09-07 02:47 UTCEG score recompute
  36. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-09-06 02:53 UTCEG score recompute
  38. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-09-05 04:01 UTCEG score recompute
  40. 2026-09-04 05:08 UTCEG score recompute
  41. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  42. 2026-09-03 05:44 UTCEG score recompute
  43. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  44. 2026-09-02 06:48 UTCEG score recompute
  45. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  46. 2026-09-01 07:56 UTCEG score recompute
  47. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  48. 2026-08-31 08:57 UTCEG score recompute
  49. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  50. 2026-08-30 09:16 UTCEG score recompute
  51. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  52. 2026-08-29 10:23 UTCEG score recompute
  53. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  54. 2026-08-28 11:31 UTCEG score recompute
  55. 2026-08-27 12:39 UTCEG score recompute
  56. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  57. 2026-08-25 14:53 UTCEG score recompute
  58. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  59. 2026-08-24 16:02 UTCEG score recompute
  60. 2026-08-23 17:07 UTCEG score recompute
  61. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  62. 2026-08-22 18:16 UTCEG score recompute
  63. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  64. 2026-08-21 19:24 UTCEG score recompute
  65. 2026-08-21 18:19 UTCEG score recompute
  66. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  67. 2026-08-19 21:19 UTCEG score recompute
  68. 2026-08-19 20:54 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  69. 2026-08-19 20:52 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-68555?
CVE-2026-68555 is a medium-severity vulnerability; its CVE record was published on August 19, 2026. Coturn is a free open source implementation of TURN and STUN Server. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobilebegintransition() in src/server/nsturnserver.c disarms each…
When was the CVE record for CVE-2026-68555 published?
The CVE record for CVE-2026-68555 was published on August 19, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-68555 actively exploited?
CVE-2026-68555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68555?
CVE-2026-68555 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-68555?
A fix for CVE-2026-68555 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-68555

Explore →

Is Your Infrastructure Affected by CVE-2026-68555?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs