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CVE-2026-25598

Bypassing Logging of Outbound Connections Using sendto, sendmsg, and sendmmsg in Harden-Runner (Community Tier)

Published: Feb 9, 2026Updated: Feb 28, 2026 Sources: CVE List NVD GHSACWE-778
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 77.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Harden-Runner is a CI/CD security agent that works like an EDR for GitHub Actions runners. Prior to 2.14.2, a security vulnerability has been identified in the Harden-Runner GitHub Action (Community Tier) that allows outbound network connections to evade audit logging. Specifically, outbound traffic using the sendto, sendmsg, and sendmmsg socket system calls can bypass detection and logging when using egress-policy: audit. This vulnerability is fixed in 2.14.2.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-778

Affected Products

harden-runnerstepsecurity
On-prem
Security Products / vuln-mgmt-scanner
step-security/harden-runnerGitHub Actions
SaaS
DevTools & CI / ci-cd
harden-runnerstep-security
On-prem
Security Products / vuln-mgmt-scanner
stepsecuritycommercialSecurity Products
github actionscommercialUSDevTools & CIaka github actions
step-securitycommercialSecurity Productsaka step-security

Exploitability

Official Patch Available

References

https://github.com/step-security/harden-runner/releases/tag/v2.14.2
github.com
https://github.com/step-security/harden-runner/security/advisories/GHSA-cpmj-h4f6-r6pq
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-25598
nvd.nist.gov
and 2 more references View all →

Timeline

Published
Feb 9, 2026
Last Updated
Feb 28, 2026

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