CVE-2026-56684

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 58% 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
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: None knownExposed: 0

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

Valkey is a distributed key-value database. Prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1, Valkey's tlsProcessPendingData function iterates pending_list while an authenticated client can trigger CLIENT KILL, causing connTLSClose to delete the iterator's cached next node and producing a use-after-free that can crash the server or potentially allow remote code execution when TLS is enabled. This issue is fixed in versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 19, 2026

Advisory Details (8)

Auto-updated Aug 18, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

9.1.1

Patch available: valkey-io/valkey 9.1.1

https://github.com/valkey-io/valkey/releases/tag/9.1.1
github_release Patch Available

9.0.5

Patch available: valkey-io/valkey 9.0.5

https://github.com/valkey-io/valkey/releases/tag/9.0.5
github_release Patch Available

8.1.9

Patch available: valkey-io/valkey 8.1.9

https://github.com/valkey-io/valkey/releases/tag/8.1.9
github_release Patch Available

8.0.10

Patch available: valkey-io/valkey 8.0.10

https://github.com/valkey-io/valkey/releases/tag/8.0.10
github_release Patch Available

7.2.14

Patch available: valkey-io/valkey 7.2.14

https://github.com/valkey-io/valkey/releases/tag/7.2.14
github_commit Patch Available

commit 7cd5bcb7575d (valkey-io/valkey)

Patch available: valkey-io/valkey 7.2.14 (contains commit 7cd5bcb7575d)

https://github.com/valkey-io/valkey/commit/7cd5bcb7575d750ec2de618db80da58680a10fe3
github_pr

Fix use-after-free in tlsProcessPendingData() on CLIENT KILL (CVE-2026-56684)

Fix merged in valkey-io/valkey PR #4234 on 2026-07-21 — awaiting tagged release

https://github.com/valkey-io/valkey/pull/4234
github Patch Available

UAF in Valkey with TLS may lead to remote code execution · Advisory · valkey-io/valkey · GitHub

https://github.com/valkey-io/valkey/security/advisories/GHSA-53mc-f3m3-99vh

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 23× 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 01:22 UTCEPSS rescore
  2. 2026-08-29 03:58 UTCEG score recompute
  3. 2026-08-28 21:42 UTCEPSS rescore
  4. 2026-08-27 22:41 UTCEG score recompute
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 21:57 UTCEG score recompute
  7. 2026-08-26 14:46 UTCEPSS rescore
  8. 2026-08-25 21:10 UTCEG score recompute
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-24 20:24 UTCEG score recompute
  11. 2026-08-23 07:17 UTCEG score recompute
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-22 06:33 UTCEG score recompute
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 05:49 UTCEG score recompute
  16. 2026-08-20 22:55 UTCEPSS rescore
  17. 2026-08-20 05:05 UTCEG score recompute
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-19 04:20 UTCEG score recompute
  20. 2026-08-19 04:11 UTCEG score recompute
  21. 2026-08-18 15:19 UTCEG score recompute
  22. 2026-08-18 14:32 UTCEG score recompute
  23. 2026-08-18 14:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-56684?
CVE-2026-56684 is a high vulnerability published on August 18, 2026. Valkey is a distributed key-value database. Prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1, Valkey's tlsProcessPendingData function iterates pending_list while an authenticated client can trigger CLIENT KILL, causing connTLSClose to delete the iterator's cached next node and producing a…
When was CVE-2026-56684 disclosed?
CVE-2026-56684 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56684 actively exploited?
CVE-2026-56684 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 57.8% of all scored CVEs.
What is the CVSS score of CVE-2026-56684?
CVE-2026-56684 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-56684?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56684, 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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