---
id: CVE-2026-53839
title: >-
  OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry
  endpoint checks that allows matching hostname prefixes instead of exact
  hostnames
summary: >-
  OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry
  endpoint checks that allows matching hostname prefixes instead of exact
  hostnames. Attackers can exploit this by crafting a hostname prefix resembling
  a trust…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-1023
vendor: openclaw
product: openclaw
affected:
  - openclaw < 2026.5.7
patched:
  - openclaw 2026.5.7
published: '2026-06-12'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:17:20.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53839'
references:
  - url: >-
      https://github.com/openclaw/openclaw/security/advisories/GHSA-77q5-rr5v-x43q
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/openclaw-hostname-prefix-matching-bypass-in-trusted-retry-endpoint-validation
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-15T18:12:17.313642Z'
epss: 0.00461
epssPercentile: 0.37936
ingestedAt: '2026-10-08T16:52:14.688Z'
---

## Overview

OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames. Attackers can exploit this by crafting a hostname prefix resembling a trusted host to send authentication material to untrusted endpoints.

## Affected

- `openclaw < 2026.5.7`

## Remediation

Upgrade past the affected range:

- `openclaw 2026.5.7`