CVE-2026-56719

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-16. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that allows unauthenticated attackers to read beyond the end of the request buffer by supplying a crafted uniPwdLen field value in a minimal SMB1 SessionSetupAndX frame. The out-of-bounds read occurs in the SessionSetupAndX handler before any credential validation, potentially exposing sensitive memory contents.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

MikroTik RouterOS < 7.24 Out-of-Bounds Read via SMB1 SessionSetupAndX | Advisories | VulnCheck

https://www.vulncheck.com/advisories/mikrotik-routeros-out-of-bounds-read-via-smb1-sessionsetupandx
generic

7.24 [stable] is released! - Announcements - MikroTik community forum

https://forum.mikrotik.com/t/7-24-stable-is-released/272381

Vendor Advisories for CVE-2026-56719(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 20× in last 7d / 29× 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. 2026-09-24 20:55 UTCEG score recompute
  2. 2026-09-24 20:55 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 04:55 UTCEG score recompute
  5. 2026-09-24 04:55 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 06:23 UTCEG score recompute
  8. 2026-09-23 06:23 UTCGHSA enrichment
  9. 2026-09-22 07:50 UTCEG score recompute
  10. 2026-09-22 07:50 UTCGHSA enrichment
  11. 2026-09-21 09:18 UTCEG score recompute
  12. 2026-09-21 09:18 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 10:45 UTCEG score recompute
  15. 2026-09-20 10:45 UTCGHSA enrichment
  16. 2026-09-19 12:12 UTCEG score recompute
  17. 2026-09-19 12:12 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 13:39 UTCEG score recompute
  20. 2026-09-18 13:39 UTCGHSA enrichment
  21. 2026-09-17 19:31 UTCEPSS rescore
  22. 2026-09-17 15:07 UTCGHSA enrichment
  23. 2026-09-16 16:35 UTCEG score recompute
  24. 2026-09-16 16:34 UTCGHSA enrichment
  25. 2026-09-16 15:55 UTCEG score recompute
Show 4 more
  1. 2026-09-16 15:55 UTCGHSA enrichment
  2. 2026-09-16 14:24 UTCEG score recompute
  3. 2026-09-16 13:28 UTCEG score recompute
  4. 2026-09-16 13:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56719?
CVE-2026-56719 is a medium vulnerability published on September 16, 2026. MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that allows unauthenticated attackers to read beyond the end of the request buffer by supplying a crafted uniPwdLen field value in a minimal SMB1 SessionSetupAndX frame. The out-of-bounds read…
When was CVE-2026-56719 disclosed?
CVE-2026-56719 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56719 actively exploited?
CVE-2026-56719 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 69.3% of all scored CVEs.
What is the CVSS score of CVE-2026-56719?
CVE-2026-56719 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-56719?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56719, 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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