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CVE-2026-53839 OpenClaw CVE debrief

CVE-2026-53839 is a medium-severity vulnerability in OpenClaw, a software that contains a hostname validation vulnerability in retry endpoint checks. The vulnerability allows attackers to craft a hostname prefix resembling a trusted host to send authentication material to untrusted endpoints. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 6, indicating a medium severity level.

Vendor
OpenClaw
Product
Unknown
CVSS
MEDIUM 6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-07-14
Advisory published
2026-06-12
Advisory updated
2026-07-14

Who should care

Users of OpenClaw software should be aware of this vulnerability and take necessary steps to update to a patched version.

Technical summary

The vulnerability is caused by the software's use of hostname prefix matching instead of exact hostname validation in retry endpoint checks. This allows attackers to send authentication material to untrusted endpoints by crafting a hostname prefix that resembles a trusted host.

Defensive priority

medium

Recommended defensive actions

  • Update OpenClaw to version 2026.5.7 or later.
  • Review and update any affected systems or configurations.

Evidence notes

The CVE record and NVD detail pages provide additional information about this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53839 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53839

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53839 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53839

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.