CVE-2026-53839: OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows mat

Routine

MEDIUM 6.5UPGRADE

CVE-2026-53839 is a medium-severity flaw (CVSS 6.5) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-1023
Published	2026-06-12
Last modified	2026-10-08

Publisher (CNA): VulnCheck · Vendor: openclaw

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-12 22:16 UTCPublished CVE record published
2026-10-08 16:17 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 2026.5.7

Fixed in: 2026.5.7

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.5.7

npm install openclaw@">=2026.5.7"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53839?

openclaw: upgrade to 2026.5.7. Exact commands for each OS are on this page.

Is CVE-2026-53839 being exploited?

CVE-2026-53839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53839 affect?

CVE-2026-53839 affects openclaw. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-53839?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2026-53855 HIGH 8.1 UPGRADE OpenClaw before 2026.4.2 contains an inline-eval bypass vulnerability allowing authenticated operators to weak
CVE-2026-53857 HIGH 8.1 UPGRADE OpenClaw before 2026.5.3 contains a policy enforcement vulnerability where Zalo contacts with mutable display
CVE-2026-53851 MEDIUM 5.3 UPGRADE OpenClaw before 2026.5.12 contains a notification bypass vulnerability allowing Slack reaction events to enter
CVE-2026-53846 HIGH 7.1 UPGRADE OpenClaw before 2026.4.29 contains a path traversal vulnerability in the install helper that allows workspace
CVE-2026-59261 HIGH 7.1 UPGRADE OpenClaw before 2026.5.28 contains a credential exposure vulnerability where workspace dotenv files can overri

References

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