CVE-2026-89021

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreHIGH confidence

Score 6.9 from GitHub Security Advisory published 2026-09-14. a secondary CVSS source baseline 6.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.9Exploit: None knownExposed: 0

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

MikroTik RouterOS before 7.24.2 contains a path traversal vulnerability in the container package OCI/tar image extraction that allows attackers to write files outside the container root by supplying a crafted container image with symlinks pointing to arbitrary paths. Attackers can exploit unsanitized tar member path extraction during container import via /container/add to achieve root-privileged file creation, directory creation, file deletion via overlayfs whiteout, and hardlink creation on the persistent data partition without ever starting the container. The 7.23.x long-term branch does not contain this fix; the container binaries in container-7.23.3.npk and container-7.23.4.npk are byte-identical, and there is no fixed long-term release at the time of publication.

CVSS v3
6.9
EG Score
6.9(high)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity69% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

MikroTik RouterOS Path Traversal via Container OCI/tar Image Extraction | Advisories | VulnCheck

https://www.vulncheck.com/advisories/mikrotik-routeros-path-traversal-via-container-oci-tar-image-extraction
generic

MikroTik · September 2026 vulnerability

https://mikrotik.com/supportsec/september-2026-vulnerability

Vendor Advisories for CVE-2026-89021(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 20× 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. 2026-09-20 14:05 UTCEG score recompute
  2. 2026-09-20 14:05 UTCGHSA enrichment
  3. 2026-09-19 14:11 UTCEG score recompute
  4. 2026-09-19 14:11 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 14:16 UTCEG score recompute
  7. 2026-09-18 14:16 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-17 14:20 UTCGHSA enrichment
  10. 2026-09-16 14:25 UTCEG score recompute
  11. 2026-09-16 14:25 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 13:41 UTCEG score recompute
  14. 2026-09-16 13:41 UTCGHSA enrichment
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 19:14 UTCEG score recompute
  17. 2026-09-15 19:14 UTCGHSA enrichment
  18. 2026-09-14 19:19 UTCEG score recompute
  19. 2026-09-14 18:25 UTCEG score recompute
  20. 2026-09-14 18:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-89021?
CVE-2026-89021 is a medium vulnerability published on September 14, 2026. MikroTik RouterOS before 7.24.2 contains a path traversal vulnerability in the container package OCI/tar image extraction that allows attackers to write files outside the container root by supplying a crafted container image with symlinks pointing to arbitrary paths. Attackers can exploit…
When was CVE-2026-89021 disclosed?
CVE-2026-89021 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-89021 actively exploited?
CVE-2026-89021 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 84.1% of all scored CVEs.
What is the CVSS score of CVE-2026-89021?
CVE-2026-89021 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-89021?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-89021, 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

Explore the affected products and dependency analysis for CVE-2026-89021

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