CVE-2026-88265

MEDIUMPre-NVD 5.65.6—
EchelonGraph scoreHIGH confidence

Score 5.6 from GitHub Security Advisory published 2026-09-10. a secondary CVSS source baseline 5.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.6Exploit: None knownExposed: 0

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

A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.

CVSS v3
5.6
EG Score
5.6(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity56% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Sep 10, 2026
Patch available. Sources: redhat.
generic

GitHub - containers/crun: A fast and lightweight fully featured OCI runtime and C library for running containers · GitHub

https://github.com/containers/crun/
redhat

2531224 – (CVE-2026-88265) CVE-2026-88265 crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown

https://bugzilla.redhat.com/show_bug.cgi?id=2531224
redhat Patch Available

CVE-2026-88265 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-88265

Vendor Advisories for CVE-2026-88265(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 19× in last 7d / 36× 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 20:16 UTCEPSS rescore
  2. 2026-09-19 22:39 UTCEG score recompute
  3. 2026-09-19 22:39 UTCGHSA enrichment
  4. 2026-09-18 21:21 UTCEG score recompute
  5. 2026-09-18 21:21 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-17 20:04 UTCGHSA enrichment
  8. 2026-09-16 18:09 UTCEG score recompute
  9. 2026-09-16 18:09 UTCGHSA enrichment
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 16:35 UTCEG score recompute
  13. 2026-09-15 16:35 UTCGHSA enrichment
  14. 2026-09-15 15:25 UTCEG score recompute
  15. 2026-09-15 15:25 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 23:34 UTCGHSA enrichment
  18. 2026-09-13 22:16 UTCEG score recompute
  19. 2026-09-13 22:16 UTCGHSA enrichment
  20. 2026-09-13 16:48 UTCEPSS rescore
  21. 2026-09-12 20:58 UTCEG score recompute
  22. 2026-09-12 20:58 UTCGHSA enrichment
  23. 2026-09-12 15:02 UTCEPSS rescore
  24. 2026-09-11 19:40 UTCEG score recompute
  25. 2026-09-11 19:40 UTCGHSA enrichment
Show 11 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 14:53 UTCEPSS rescore
  3. 2026-09-10 18:22 UTCEG score recompute
  4. 2026-09-10 18:22 UTCGHSA enrichment
  5. 2026-09-10 17:50 UTCEG score recompute
  6. 2026-09-10 17:50 UTCGHSA enrichment
  7. 2026-09-10 14:57 UTCGHSA enrichment
  8. 2026-09-10 09:36 UTCEG score recompute
  9. 2026-09-10 09:36 UTCGHSA enrichment
  10. 2026-09-10 09:10 UTCEG score recompute
  11. 2026-09-10 09:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88265?
CVE-2026-88265 is a medium vulnerability published on September 10, 2026. A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed…
When was CVE-2026-88265 disclosed?
CVE-2026-88265 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88265 actively exploited?
CVE-2026-88265 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 98.0% of all scored CVEs.
What is the CVSS score of CVE-2026-88265?
CVE-2026-88265 has a CVSS v3 base score of 5.6 (NVD).
How do I remediate CVE-2026-88265?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88265, 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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