Vulnerability-Lookup

CVE-2026-25598 (GCVE-0-2026-25598)

Vulnerability from cvelistv5 – Published: 2026-02-09 18:58 – Updated: 2026-02-10 16:00

Title

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

Summary

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.

Severity ?

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CWE

CWE-778 - Insufficient Logging

Assigner

GitHub_M

References

URL

Tags

	https://github.com/step-security/harden-runner/se…	x_refsource_CONFIRM
	https://github.com/step-security/harden-runner/re…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	step-security	harden-runner	Affected: < 2.14.2

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-25598

Vulnerability from fkie_nvd - Published: 2026-02-09 20:15 - Updated: 2026-02-09 21:55

Severity ?

6.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/step-security/harden-runner/releases/tag/v2.14.2
	security-advisories@github.com	https://github.com/step-security/harden-runner/security/advisories/GHSA-cpmj-h4f6-r6pq

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-25598",
  "lastModified": "2026-02-09T21:55:30.093",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
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          "Recovery": "NOT_DEFINED",
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          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "version": "4.0",
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        "type": "Secondary"
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  "published": "2026-02-09T20:15:58.653",
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      "url": "https://github.com/step-security/harden-runner/releases/tag/v2.14.2"
    },
    {
      "source": "security-advisories@github.com",
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    }
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}

GHSA-CPMJ-H4F6-R6PQ

Vulnerability from github – Published: 2026-02-09 17:19 – Updated: 2026-02-09 22:39

Summary

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

Details

Summary

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.

Note: This vulnerability only affects audit mode. When using egress-policy: block, these connections are properly blocked. It requires the attacker to already have code execution capabilities within the GitHub Actions workflow (e.g., through workflow injection or compromised dependencies)

Affected Versions

Harden-Runner Community Tier: All versions prior to v2.14.2
Harden-Runner Enterprise Tier: NOT AFFECTED

Severity

Medium - This vulnerability affects audit logging capabilities but requires the attacker to already have code execution within the workflow.

Impact

When Harden-Runner is configured in audit mode (egress-policy: audit), attackers with the ability to execute arbitrary code in a workflow can: - Send outbound network traffic without generating audit logs - Bypass network monitoring for UDP-based communications

Important: This vulnerability requires the attacker to already have code execution capabilities within the GitHub Actions workflow (e.g., through workflow injection or compromised dependencies).

Technical Details

The vulnerability stems from incomplete monitoring coverage of certain socket-related system calls. Specifically, the following system calls can be used to send UDP traffic without triggering audit events:

sendto()
sendmsg()
sendmmsg()

An attacker with code execution in a workflow can compile and execute native code that uses these system calls to establish covert communication channels.

Affected Users

This vulnerability ONLY affects users of the Harden-Runner Community Tier.

The Harden-Runner Enterprise Tier is NOT vulnerable to this bypass technique.

Remediation

For Community Tier Users

Upgrade to Harden-Runner v2.14.2 or later. This version includes fixes for the logging bypass vulnerability.

For Enterprise Tier Users

No action required. Enterprise tier customers are not affected by this vulnerability.

Credit

We would like to thank Devansh Batham for responsibly disclosing this vulnerability through our security reporting process. Devansh was communicative throughout the process and verified the fix before the fix before it was made public.

Severity ?

6.0 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "GitHub Actions",
        "name": "step-security/harden-runner"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.14.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25598"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-221",
      "CWE-778",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-09T17:19:14Z",
    "nvd_published_at": "2026-02-09T20:15:58Z",
    "severity": "MODERATE"
  },
  "details": "## Summary \n\nA 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`. \n\n**Note:** This vulnerability only affects audit mode. When using `egress-policy: block`, these connections are properly blocked. It requires the attacker to already have code execution capabilities within the GitHub Actions workflow (e.g., through workflow injection or compromised dependencies)\n\n## Affected Versions \n\n- Harden-Runner Community Tier: All versions prior to v2.14.2 \n- Harden-Runner Enterprise Tier: **NOT AFFECTED** \n\n## Severity \n\n**Medium** - This vulnerability affects audit logging capabilities but requires the attacker to already have code execution within the workflow. \n\n## Impact \n\nWhen Harden-Runner is configured in audit mode (`egress-policy: audit`), attackers with the ability to execute arbitrary code in a workflow can: \n- Send outbound network traffic without generating audit logs \n- Bypass network monitoring for UDP-based communications \n\n**Important:** This vulnerability requires the attacker to already have code execution capabilities within the GitHub Actions workflow (e.g., through workflow injection or compromised dependencies). \n\n## Technical Details \n\nThe vulnerability stems from incomplete monitoring coverage of certain socket-related system calls. Specifically, the following system calls can be used to send UDP traffic without triggering audit events: \n\n- `sendto()` \n\n- `sendmsg()` \n\n- `sendmmsg()` \n\nAn attacker with code execution in a workflow can compile and execute native code that uses these system calls to establish covert communication channels. \n\n## Affected Users \n\n**This vulnerability ONLY affects users of the Harden-Runner Community Tier.** \n\nThe Harden-Runner Enterprise Tier is **NOT vulnerable** to this bypass technique. \n\n## Remediation \n\n### For Community Tier Users \n \n**Upgrade to Harden-Runner v2.14.2 or later.** This version includes fixes for the logging bypass vulnerability. \n\n### For Enterprise Tier Users \n\nNo action required. Enterprise tier customers are not affected by this vulnerability. \n\n## Credit \n\nWe would like to thank [Devansh Batham](https://github.com/devanshbatham) for responsibly disclosing this vulnerability through our security reporting process. Devansh was communicative throughout the process and verified the fix before the fix before it was made public.",
  "id": "GHSA-cpmj-h4f6-r6pq",
  "modified": "2026-02-09T22:39:28Z",
  "published": "2026-02-09T17:19:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/step-security/harden-runner/security/advisories/GHSA-cpmj-h4f6-r6pq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25598"
    },
    {
      "type": "WEB",
      "url": "https://github.com/step-security/harden-runner/commit/5ef0c079ce82195b2a36a210272d6b661572d83e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/step-security/harden-runner"
    },
    {
      "type": "WEB",
      "url": "https://github.com/step-security/harden-runner/releases/tag/v2.14.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Harden-Runner: Bypassing Logging of Outbound Connections Using sendto, sendmsg, and sendmmsg in Harden-Runner (Community Tier)"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-25598 (GCVE-0-2026-25598)

FKIE_CVE-2026-25598

GHSA-CPMJ-H4F6-R6PQ

Summary

Affected Versions

Severity

Impact

Technical Details

Affected Users

Remediation

For Community Tier Users

For Enterprise Tier Users

Credit

Tags

Sightings

Nomenclature