CVE-2026-44253

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.9 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
Elevated
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.9Exploit: Elevated riskExposed: 0

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

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receive_str() method accepts an attacker-controlled total for InBuffer without a maximum, so a new_str command can request a multi-gigabyte bytearray and repeated requests accumulate in in_str. The divided-message path also retains flag_divided fragments under unique counters in div_msg_box without a count, aggregate-size, or expiration limit. Exploitation can disrupt agent connectivity and alert processing across the monitored environment. This issue is fixed in versions 4.14.5 and 5.0.0-beta2.

CVSS v3
4.9
EG Score
4.9(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity49% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (4)

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

Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation — Wazuh 4.14.4 · Advisory · wazuh/wazuh · GitHub

https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2
github_release Patch Available

Wazuh v4.14.5

Patch available: wazuh/wazuh v4.14.5

https://github.com/wazuh/wazuh/releases/tag/v4.14.5
github_pr Patch Available

Fix uncontroller memory allocation in cluster

Patch available: wazuh/wazuh v4.14.5 (PR #35173 merged 2026-03-31)

https://github.com/wazuh/wazuh/pull/35173
github_commit Patch Available

commit d29c5c89a0e1 (wazuh/wazuh)

Patch available: wazuh/wazuh v4.14.5 (contains commit d29c5c89a0e1)

https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× 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. 2026-09-19 07:06 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 08:39 UTCEG score recompute
  4. 2026-09-17 19:31 UTCEPSS rescore
  5. 2026-09-17 10:12 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 11:46 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 13:19 UTCEG score recompute
  10. 2026-09-14 14:52 UTCEG score recompute
  11. 2026-09-13 16:47 UTCEPSS rescore
  12. 2026-09-12 17:58 UTCEG score recompute
  13. 2026-09-12 15:01 UTCEPSS rescore
  14. 2026-09-11 19:31 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 09:37 UTCEPSS rescore
  17. 2026-09-10 21:04 UTCEG score recompute
  18. 2026-09-10 09:34 UTCEPSS rescore
  19. 2026-09-09 02:36 UTCEG score recompute
  20. 2026-09-08 22:00 UTCEPSS rescore
  21. 2026-09-07 16:01 UTCEPSS rescore
  22. 2026-09-06 15:49 UTCEG score recompute
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-05 17:22 UTCEG score recompute
  25. 2026-09-04 18:51 UTCEG score recompute
Show 27 more
  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-02 21:19 UTCEG score recompute
  3. 2026-09-02 14:12 UTCEPSS rescore
  4. 2026-09-01 19:57 UTCEG score recompute
  5. 2026-09-01 13:54 UTCEPSS rescore
  6. 2026-08-30 22:47 UTCEG score recompute
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 01:22 UTCEPSS rescore
  9. 2026-08-29 01:55 UTCEG score recompute
  10. 2026-08-28 21:41 UTCEPSS rescore
  11. 2026-08-27 22:43 UTCEG score recompute
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-27 00:16 UTCEG score recompute
  14. 2026-08-26 14:46 UTCEPSS rescore
  15. 2026-08-26 01:48 UTCEG score recompute
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-25 03:22 UTCEG score recompute
  18. 2026-08-25 02:20 UTCEG score recompute
  19. 2026-08-23 10:22 UTCEG score recompute
  20. 2026-08-23 00:19 UTCEPSS rescore
  21. 2026-08-22 11:53 UTCEG score recompute
  22. 2026-08-21 23:49 UTCEPSS rescore
  23. 2026-08-21 13:26 UTCEG score recompute
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-19 16:24 UTCEG score recompute
  26. 2026-08-19 16:12 UTCEG score recompute
  27. 2026-08-19 16:12 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-44253?
CVE-2026-44253 is a medium vulnerability published on August 19, 2026. Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receivestr() method…
When was CVE-2026-44253 disclosed?
CVE-2026-44253 was first published in the National Vulnerability Database 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-2026-44253 actively exploited?
CVE-2026-44253 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-2026-44253?
CVE-2026-44253 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-44253?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44253, 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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