CVE-2026-15809

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-15. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 3 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

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

A flaw was found in CRI-O. The fix for a previous vulnerability (CVE-2022-4318) was incorrect, allowing it to be bypassed. An attacker capable of setting environment variables on a container can inject a newline character into the HOME environment variable. This issue allows the addition of arbitrary lines into /etc/passwd by use of a specially crafted environment variable.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
2.7%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 17, 2026

Advisory Details (5)

Auto-updated Jul 15, 2026
Patch available. Sources: github_pr, redhat.
github_pr

[release-1.25] server: fail if HOME variable has a newline

Fix merged in cri-o/cri-o PR #6524 on 2023-02-22 — awaiting tagged release

https://github.com/cri-o/cri-o/pull/6524
github_pr Patch Available

server: fail if HOME variable has a newline

Patch available: cri-o/cri-o v1.32.10 (PR #6450 merged 2022-12-20)

https://github.com/cri-o/cri-o/pull/6450
redhat

2500846 – (CVE-2026-15809) CVE-2026-15809 github.com/cri-o/cri-o: Fix Bypass for CVE-2022-4318 — /etc/passwd Injection via HOME env

https://bugzilla.redhat.com/show_bug.cgi?id=2500846
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/cve-2022-4318
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-15809

Vendor Advisories for CVE-2026-15809(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 12× in last 7d / 16× 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. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 03:05 UTCEG score recompute
  3. 2026-07-22 14:08 UTCEPSS rescore
  4. 2026-07-21 15:24 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:30 UTCEPSS rescore
  7. 2026-07-19 02:28 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-17 13:37 UTCEG score recompute
  10. 2026-07-17 13:37 UTCGHSA enrichment
  11. 2026-07-17 02:44 UTCGHSA enrichment
  12. 2026-07-16 17:02 UTCEPSS rescore
  13. 2026-07-16 14:07 UTCGHSA enrichment
  14. 2026-07-16 01:31 UTCGHSA enrichment
  15. 2026-07-15 12:54 UTCEG score recompute
  16. 2026-07-15 12:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15809?
CVE-2026-15809 is a high vulnerability published on July 15, 2026. A flaw was found in CRI-O. The fix for a previous vulnerability (CVE-2022-4318) was incorrect, allowing it to be bypassed. An attacker capable of setting environment variables on a container can inject a newline character into the HOME environment variable. This issue allows the addition of…
When was CVE-2026-15809 disclosed?
CVE-2026-15809 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15809 actively exploited?
CVE-2026-15809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-15809?
CVE-2026-15809 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-15809?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15809, 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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