CVE-2025-311337.3HighCWE-61

CVE-2025-31133: runc container escape via "masked path" abuse due to mount race conditions

opencontainers · runc

Affected: opencontainers runc · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.2%probability of exploitation in the next 30 days

69th percentile

050100

Higher than 69% of scored CVEs

7.3HighCVSS 4.0

LowMediumHighCrit.

DescriptionCVE.org

runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, 1.4.0-rc.1 and 1.4.0-rc.2 files, runc would not perform sufficient verification that the source of the bind-mount (i.e., the container's /dev/null) was actually a real /dev/null inode when using the container's /dev/null to mask. This exposes two methods of attack: an arbitrary mount gadget, leading to host information disclosure, host denial of service, container escape, or a bypassing of maskedPaths. This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

opencontainers · runc< 1.2.8; >= 1.3.0-rc.1, < 1.3.3; >= 1.4.0-rc.1, <= 1.4.0-rc.3

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: UNIX Symbolic Link (Symlink) Following · File and Path Handling
Vendor: opencontainers
Published: November 2025
Band: Possible (1 to 10%), November 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-31133 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.