CVE-2026-15809

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{"acknowledgement": "Red Hat would like to thank Neboj\u0161a Ja\u0107ovi\u0107 for reporting this issue.", "bugzilla": {"description": "cri-o: Fix Bypass for CVE-2022-4318 \u2014 /etc/passwd Injection via HOME env", "id": "2500846", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500846"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-15809", "public_date": "2026-07-15T10:18:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-15809\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-15809\nhttps://github.com/cri-o/cri-o/pull/6450\nhttps://github.com/cri-o/cri-o/pull/6524"], "statement": "This Important flaw in CRI-O allows for arbitrary line injection into a container's `/etc/passwd` file. An attacker capable of setting container environment variables can bypass a previous fix (CVE-2022-4318) by supplying a real newline character in the `HOME` environment variable, potentially leading to privilege escalation within the affected container. This risk is present in environments where untrusted users can influence container environment variable settings.", "threat_severity": "Important"}

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