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Runc CVE-2025-31133

HIGH
UNIX Symbolic Link (Symlink) Following (CWE-61)
2025-11-06 security-advisories@github.com
Denial Of Service Information Disclosure Runc Linuxfoundation
7.3
CVSS 4.0 · Vendor: github
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Vulnerability Assessment

Weakness
CWE
CWE-61
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling UNIX symlink resolution
Impact

CVSS score of 7.3 (HIGH). Attack characteristics: local attack vector, low complexity, low privileges required, user interaction required. EPSS exploitation probability: 0.03%.
Exploit ScenarioDerived

Successful exploitation could compromise the high-severity affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

runc is a CLI tool for spawning and running containers according to the OCI specification. Rated high severity (CVSS 7.3), this vulnerability is low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

go github.com/opencontainers/runc fix: 1.2.8, 1.3.3, 1.4.0-rc.3

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

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Technical ContextAI · show details

This vulnerability is classified under CWE-61. 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 products include: Linuxfoundation Runc. Version information: through 1.3.1.

Severity by source

Vendor (github) PRIMARY 7.3 HIGH
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SUSE 7.8 HIGH
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Red Hat 8.2 HIGH

Primary rating from Vendor (github).

CVSS VectorVendor: github

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
Low
User Interaction
Active
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
High
Vulnerable system: Availability
High
Subsequent system: Confidentiality
High
Subsequent system: Integrity
High
Subsequent system: Availability
High

Lifecycle Timeline

2
Patch released
Mar 28, 2026 - 19:20 nvd
Patch available
CVE Published
Nov 06, 2025 - 19:15 nvd
HIGH 7.3

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.

Executive ViewAI

Why It Matters

Organizations using runc face moderate risk from CVE-2025-31133 rated CVSS 7.3. Exploitation could compromise the security of affected deployments. A patch is available and should be applied as part of regular vulnerability management.

Business Impact: Moderate
Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score
0.0%
Top 93% exploitable
Exploit
POC
Public exploit code exists
Data Quality
5 sources
Confidence: Medium
NVD CVE.org EPSS Vendor GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived
Poc
System Exposure· derived
Small
Automatable· derived
No

Priority Score

56
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:runc:1.4.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:runc:1.4.0:rc2:*:*:*:*:*:*

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Same weakness CWE-61 – UNIX Symbolic Link (Symlink) Following

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Same technique Denial Of Service

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.99 Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-5.7 Image SL-Micro Affected
Container suse/sl-micro/6.0/toolbox:latest Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.29 Affected
Container suse/sl-micro/6.1/base-os-container:2.2.0-4.57 Affected

References

Advisories & patches
PATCH https://github.com/opencontainers/runc/commit/1a30a8f3d921acbbb6a4bb7e99da2c05f8d48522 PATCH https://github.com/opencontainers/runc/commit/5d7b2424072449872d1cd0c937f2ca25f418eb66 PATCH https://github.com/opencontainers/runc/commit/8476df83b534a2522b878c0507b3491def48db9f PATCH https://github.com/opencontainers/runc/commit/db19bbed5348847da433faa9d69e9f90192bfa64 PATCH https://github.com/opencontainers/runc/security/advisories/GHSA-9493-h29p-rfm2 ADVISORY https://access.redhat.com/errata/RHSA-2025:19927 ADVISORY https://access.redhat.com/errata/RHSA-2025:20957 ADVISORY https://access.redhat.com/errata/RHSA-2025:21232 ADVISORY https://access.redhat.com/errata/RHSA-2025:21795 ADVISORY https://access.redhat.com/errata/RHSA-2025:21824 ADVISORY https://access.redhat.com/errata/RHSA-2025:22275 ADVISORY https://access.redhat.com/errata/RHSA-2025:23113 ADVISORY https://access.redhat.com/errata/RHSA-2026:0315 ADVISORY https://access.redhat.com/errata/RHSA-2026:0331 ADVISORY https://access.redhat.com/errata/RHSA-2026:0418 ADVISORY https://access.redhat.com/errata/RHSA-2026:0425 ADVISORY https://access.redhat.com/errata/RHSA-2026:0676 ADVISORY https://access.redhat.com/errata/RHSA-2026:0701 ADVISORY https://access.redhat.com/errata/RHSA-2026:0995 ADVISORY https://access.redhat.com/errata/RHSA-2026:1540 ADVISORY https://access.redhat.com/errata/RHSA-2026:2681 ADVISORY https://access.redhat.com/errata/RHSA-2026:4531 ADVISORY https://access.redhat.com/errata/RHSA-2026:4693 ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:21036/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:21038/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:21054/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:21072/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:21136/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:3950/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:3951/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:4073/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:4077/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:4079/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:4080/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:4081/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0327/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20103/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20116/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20123/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20214/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20626/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20641/

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