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PatchSiren cyber security CVE debrief

CVE-2026-57231 Podman Project CVE debrief

CVE-2026-57231 is a high-severity vulnerability in Podman, a tool for managing OCI containers and pods. The vulnerability allows a malicious container image to exfiltrate environment variables from the host into the container. This is possible when a container image contains an environment variable with just a key and no value, which can trick Podman into passing that variable from the host into the container. The vulnerability is made worse by the fact that using an asterisk (*) will cause Podman to pass all host variables into the container. The vulnerability affects Podman versions from 1.8.1 until 5.8.4 and is fixed in versions 5.8.4 and 6.0.0.

Vendor
Podman Project
Product
Podman
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-26
Original CVE updated
2026-07-06
Advisory published
2026-06-26
Advisory updated
2026-07-06

Who should care

Users of Podman, especially those who use it to manage containers and pods in production environments, should be aware of this vulnerability and take steps to mitigate it. This includes updating to a fixed version of Podman and being cautious when using container images from untrusted sources.

Technical summary

The vulnerability is caused by Podman's handling of environment variables in container images. When a container image contains an environment variable with just a key and no value, Podman will pass that variable from the host into the container. This can be exploited by a malicious container image to exfiltrate environment variables from the host. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity.

Defensive priority

High

Recommended defensive actions

  • Update to a fixed version of Podman (5.8.4 or 6.0.0)
  • Be cautious when using container images from untrusted sources
  • Monitor environment variables in container images for suspicious activity
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The vulnerability is documented in the CVE record and the NVD detail page. The fix is available in Podman versions 5.8.4 and 6.0.0. Users should be cautious when using container images from untrusted sources and monitor environment variables in container images for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-57231 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-57231

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-57231 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-57231

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.