CVE-2026-68552

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% 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, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 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 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16_t len variable in stun_get_message_len_str() in src/client/ns_turn_msg.c to wrap when STUN_HEADER_LENGTH is added. The framing layer then consumes only 4 through 16 bytes, treats the remaining bytes as another message, desynchronizes the stream parser, and drops the attacking client's connection. Other clients and the server process are not affected. This issue is fixed in version 4.15.0.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 21, 2026

Advisory Details (4)

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

commit ed32e1fb6c84 (coturn/coturn)

Patch available: coturn/coturn 4.15.0 (contains commit ed32e1fb6c84)

https://github.com/coturn/coturn/commit/ed32e1fb6c843f9cf9a28d91c541dfbf40874f25
github_pr Patch Available

fix: avoid uint16_t truncation overflow in STUN message length

Patch available: coturn/coturn 4.15.0 (PR #1964 merged 2026-06-27)

https://github.com/coturn/coturn/pull/1964
github Patch Available

uint16_t truncation overflow in STUN message length causes TCP stream framing bypass · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-m562-mf7x-q7rr

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 20× 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.

  1. 2026-08-30 04:26 UTCEG score recompute
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-29 03:41 UTCEG score recompute
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-28 02:55 UTCEG score recompute
  6. 2026-08-27 02:10 UTCEG score recompute
  7. 2026-08-26 14:47 UTCEPSS rescore
  8. 2026-08-26 01:25 UTCEG score recompute
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-25 00:40 UTCEG score recompute
  11. 2026-08-23 23:55 UTCEG score recompute
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-22 23:11 UTCEG score recompute
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 22:26 UTCEG score recompute
  16. 2026-08-21 22:00 UTCEG score recompute
  17. 2026-08-20 22:56 UTCEPSS rescore
  18. 2026-08-19 21:19 UTCEG score recompute
  19. 2026-08-19 20:53 UTCEG score recompute
  20. 2026-08-19 20:52 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-68552?
CVE-2026-68552 is a medium vulnerability published on August 19, 2026. Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an unauthenticated remote client can send a STUN message over TCP or TLS with a body-length field from 65520 through 65532, causing the uint16t len variable in stungetmessagelenstr() in src/client/nsturnmsg.c to…
When was CVE-2026-68552 disclosed?
CVE-2026-68552 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-68552 actively exploited?
CVE-2026-68552 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 76.2% of all scored CVEs.
What is the CVSS score of CVE-2026-68552?
CVE-2026-68552 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-68552?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-68552, 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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