CVE-2026-79993

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
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.

The deleteContainer opcode (0x14/20) is processed without verifying the caller's ACL permissions, allowing any authenticated client to delete specific znodes in the data tree regardless of the ACL restrictions on the znode or its parent. This opcode is considered internal-only and the official client doesn't have API for it, but a client that can open a plain TCP session on the ZooKeeper client port (2181 by default) - with NO authentication and NO ACL permissions - can delete any empty persistent znode (including regular persistent nodes, container nodes, and TTL nodes) by issuing the raw protocol OpCode deleteContainer (20). The deleteContainer request path completely skips both the session check and the DELETE ACL check that are enforced by the regular delete (OpCode 2) path. This is an authorization bypass / ACL enforcement bug.

This issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6.

Users are recommended to upgrade to version 3.9.6 or 3.8.7, which fixes the issue.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-79993: Apache ZooKeeper: Missing ACL check on deleteContainer opcode allows unauthorized deletion of any empty persistent/container znode

http://www.openwall.com/lists/oss-security/2026/09/15/5
generic
https://lists.apache.org/thread/9cw3rmrzhqpct26v8j18fy41bghlq8y5

Vendor Advisories for CVE-2026-79993(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 42× 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. 2026-09-25 09:54 UTCGHSA enrichment
  2. 2026-09-24 23:02 UTCEG score recompute
  3. 2026-09-24 23:02 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 11:53 UTCGHSA enrichment
  6. 2026-09-24 01:01 UTCEG score recompute
  7. 2026-09-24 01:01 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 14:10 UTCGHSA enrichment
  10. 2026-09-23 03:19 UTCGHSA enrichment
  11. 2026-09-22 16:28 UTCEG score recompute
  12. 2026-09-22 16:28 UTCGHSA enrichment
  13. 2026-09-22 16:01 UTCEPSS rescore
  14. 2026-09-22 05:35 UTCEG score recompute
  15. 2026-09-22 05:35 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 18:44 UTCGHSA enrichment
  18. 2026-09-21 07:52 UTCGHSA enrichment
  19. 2026-09-20 21:00 UTCEG score recompute
  20. 2026-09-20 21:00 UTCGHSA enrichment
  21. 2026-09-20 20:16 UTCEPSS rescore
  22. 2026-09-20 10:08 UTCGHSA enrichment
  23. 2026-09-19 23:17 UTCEG score recompute
  24. 2026-09-19 23:17 UTCGHSA enrichment
  25. 2026-09-19 12:25 UTCGHSA enrichment
Show 17 more
  1. 2026-09-19 01:33 UTCEG score recompute
  2. 2026-09-19 01:33 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 14:42 UTCGHSA enrichment
  5. 2026-09-18 07:20 UTCEG score recompute
  6. 2026-09-18 07:20 UTCGHSA enrichment
  7. 2026-09-17 20:28 UTCEG score recompute
  8. 2026-09-17 20:28 UTCGHSA enrichment
  9. 2026-09-17 19:20 UTCEG score recompute▲ 7.50
  10. 2026-09-17 19:20 UTCGHSA enrichment
  11. 2026-09-17 19:19 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  12. 2026-09-16 19:12 UTCEG score recompute
  13. 2026-09-16 19:11 UTCGHSA enrichment
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 10:25 UTCNVD update
  16. 2026-09-16 09:36 UTCEG score recompute
  17. 2026-09-16 09:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-79993?
CVE-2026-79993 is a high vulnerability published on September 16, 2026. The deleteContainer opcode (0x14/20) is processed without verifying the caller's ACL permissions, allowing any authenticated client to delete specific znodes in the data tree regardless of the ACL restrictions on the znode or its parent. This opcode is considered internal-only and the official…
When was CVE-2026-79993 disclosed?
CVE-2026-79993 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79993 actively exploited?
CVE-2026-79993 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 53.5% of all scored CVEs.
What is the CVSS score of CVE-2026-79993?
CVE-2026-79993 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-79993?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79993, 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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