Vulnerability in Red Hat Confidential Compute Attestation
CVE-2026-15809
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-15809 (vdb-entry)
- access.redhat.com/security/cve/cve-2022-4318 (technical-description)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/cri-o/cri-o/pull/6450
- github.com/cri-o/cri-o/pull/6524
- access.redhat.com/errata/RHSA-2026:57361 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60444 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60449 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60452 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:62548 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-15809?
- CVE-2026-15809 is a high-severity vulnerability in Red Hat Confidential Compute Attestation, classified under Use of Externally-Controlled Format String. CVSS score: 7.8/10. Published 2026-07-15.
- How severe is CVE-2026-15809?
- High severity. CVSS v3 base score is 7.8 out of 10.