CVE-2025-31133runc is a CLI tool for spawning and running containers according to the OCI specification.
Updated under an hour ago ()
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It affects linuxfoundation runc. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-61, CWE-363
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
linuxfoundation runc linuxfoundation:runc | before 1.2.8; from 1.3.0 before 1.3.3; 1.4.0; 1.4.0 | NVD |
References
- https://github.com/opencontainers/runc/commit/1a30a8f3d921acbbb6a4bb7e99da2c05f8d48522patch
- https://github.com/opencontainers/runc/commit/5d7b2424072449872d1cd0c937f2ca25f418eb66patch
- https://github.com/opencontainers/runc/commit/8476df83b534a2522b878c0507b3491def48db9fpatch
- https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64patch
- https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2mitigation, patch, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.