CVE-2026-68553

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (39th 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
7.1EG
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: 7.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes is_secure_string() validation and is embedded into Redis keys at nine call sites in src/apps/relay/ns_ioalib_engine_impl.c. send_message_to_redis() in src/apps/relay/hiredis_libevent2.c then passes the attacker-controlled key as the format argument to redisAsyncCommand() while supplying only one variadic value, causing hiredis redisvFormatCommand() to read past the va_list. Exploitation can crash the coturn process and terminate active TURN sessions or disclose stack memory into Redis. This issue is fixed in version 4.13.0.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
48
EG Risk 48/100CISA 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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

CISA SSVCTrack 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). 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 19, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

4.13.0

Patch available: coturn/coturn 4.13.0

https://github.com/coturn/coturn/releases/tag/4.13.0
github_commit Patch Available

commit 8fa38032bb47 (coturn/coturn)

Patch available: coturn/coturn 4.13.0 (contains commit 8fa38032bb47)

https://github.com/coturn/coturn/commit/8fa38032bb4751e11e072d65a8eca3c06c950979
githubMentions a patch (unverified)🟡 PoC Available

Format String Injection via TURN USERNAME/REALM into hiredis Redis Command · Advisory · coturn/coturn · GitHub

https://github.com/coturn/coturn/security/advisories/GHSA-4g7c-p5wg-j4hp

Affected Packages

(3 across 3 ecosystems)
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, 4.6.1-2
  • every version up to 4.14.0-1: fixed in 4.14.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 49× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
  4. 2026-10-08 06:26 UTCEG score recompute
  5. 2026-10-07 23:48 UTCEPSS rescore
  6. 2026-10-06 19:25 UTCEG score recompute
  7. 2026-10-06 15:18 UTCEPSS rescore
  8. 2026-10-06 07:54 UTCEG score recompute
  9. 2026-10-05 17:43 UTCEPSS rescore
  10. 2026-10-05 05:07 UTCEG score recompute
  11. 2026-10-04 23:22 UTCEPSS rescore
  12. 2026-10-03 16:53 UTCEG score recompute
  13. 2026-10-03 14:26 UTCEPSS rescore
  14. 2026-10-02 21:46 UTCEG score recompute
  15. 2026-10-02 17:56 UTCEPSS rescore
  16. 2026-10-01 22:45 UTCEG score recompute
  17. 2026-10-01 19:50 UTCEPSS rescore
  18. 2026-09-30 20:33 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescore
  20. 2026-09-30 08:35 UTCEG score recompute
  21. 2026-09-29 02:54 UTCEG score recompute
  22. 2026-09-28 15:23 UTCEG score recompute
  23. 2026-09-28 13:52 UTCEPSS rescore
  24. 2026-09-27 16:08 UTCEG score recompute
  25. 2026-09-27 13:48 UTCEPSS rescore
Show 65 more
  1. 2026-09-27 04:24 UTCEG score recompute
  2. 2026-09-26 15:59 UTCEPSS rescore
  3. 2026-09-24 19:31 UTCEG score recompute
  4. 2026-09-23 20:07 UTCEG score recompute
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-22 19:48 UTCEG score recompute
  7. 2026-09-22 07:58 UTCEG score recompute
  8. 2026-09-21 21:09 UTCEPSS rescore
  9. 2026-09-20 20:50 UTCEG score recompute
  10. 2026-09-20 20:16 UTCEPSS rescore
  11. 2026-09-19 21:44 UTCEG score recompute
  12. 2026-09-18 21:41 UTCEG score recompute
  13. 2026-09-18 19:28 UTCEPSS rescore
  14. 2026-09-17 21:28 UTCEG score recompute
  15. 2026-09-16 20:05 UTCEG score recompute
  16. 2026-09-16 14:08 UTCEPSS rescore
  17. 2026-09-16 06:20 UTCEG score recompute
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 06:44 UTCEG score recompute
  20. 2026-09-13 18:58 UTCEG score recompute
  21. 2026-09-12 19:52 UTCEG score recompute
  22. 2026-09-11 20:50 UTCEG score recompute
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 09:37 UTCEPSS rescore
  25. 2026-09-10 10:05 UTCEG score recompute
  26. 2026-09-09 02:20 UTCEG score recompute
  27. 2026-09-08 22:01 UTCEPSS rescore
  28. 2026-09-07 16:39 UTCEG score recompute
  29. 2026-09-07 16:01 UTCEPSS rescore
  30. 2026-09-06 17:35 UTCEG score recompute
  31. 2026-09-06 13:47 UTCEPSS rescore
  32. 2026-09-05 18:32 UTCEG score recompute
  33. 2026-09-05 15:31 UTCEPSS rescore
  34. 2026-09-04 19:31 UTCEG score recompute
  35. 2026-09-04 07:57 UTCEG score recompute
  36. 2026-09-04 05:07 UTCEPSS rescore
  37. 2026-09-02 21:15 UTCEG score recompute
  38. 2026-09-02 14:12 UTCEPSS rescore
  39. 2026-09-01 22:04 UTCEG score recompute
  40. 2026-09-01 13:54 UTCEPSS rescore
  41. 2026-09-01 10:33 UTCEG score recompute
  42. 2026-09-01 04:40 UTCEPSS rescore
  43. 2026-08-30 23:55 UTCEG score recompute
  44. 2026-08-30 19:17 UTCEPSS rescore
  45. 2026-08-30 12:24 UTCEG score recompute
  46. 2026-08-30 01:22 UTCEPSS rescore
  47. 2026-08-29 01:45 UTCEG score recompute
  48. 2026-08-28 21:42 UTCEPSS rescore
  49. 2026-08-28 01:39 UTCEG score recompute
  50. 2026-08-26 15:07 UTCEG score recompute
  51. 2026-08-26 14:47 UTCEPSS rescore
  52. 2026-08-25 16:02 UTCEG score recompute
  53. 2026-08-25 13:49 UTCEPSS rescore
  54. 2026-08-24 17:01 UTCEG score recompute
  55. 2026-08-23 05:56 UTCEG score recompute
  56. 2026-08-23 00:19 UTCEPSS rescore
  57. 2026-08-22 06:55 UTCEG score recompute
  58. 2026-08-21 23:49 UTCEPSS rescore
  59. 2026-08-21 07:51 UTCEG score recompute
  60. 2026-08-20 22:56 UTCEPSS rescore
  61. 2026-08-20 20:20 UTCEG score recompute
  62. 2026-08-20 19:52 UTCEG score recompute
  63. 2026-08-19 21:19 UTCEG score recompute
  64. 2026-08-19 20:54 UTCEG score recompute
  65. 2026-08-19 20:52 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-68553?
CVE-2026-68553 is a high vulnerability published on August 19, 2026. Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN user can place printf-style format specifiers in the STUN USERNAME or REALM attribute, which passes issecurestring() validation and is embedded into Redis keys at nine call sites in…
When was CVE-2026-68553 disclosed?
CVE-2026-68553 was first published on August 19, 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-2026-68553 actively exploited?
CVE-2026-68553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68553?
CVE-2026-68553 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-68553?
A fix for CVE-2026-68553 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-2026-68553

Explore →

Is Your Infrastructure Affected by CVE-2026-68553?

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

Book a Demo →Browse All CVEs