Medium severity6.5NVD Advisory· Published Jun 16, 2026· Updated Jun 16, 2026

CVE-2026-53859

Description

OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
openclawnpm	< 2026.5.26	2026.5.26

Affected products

OpenClaw/Openclawinferred2 versions
<2026.5.26+ 1 more
- (no CPE)range: <2026.5.26
- (no CPE)range: <2026.5.26

Patches

Vulnerability mechanics

References

News mentions

OpenClaw: 25 CVEs Disclosed in a Single Day — Allowlist Bypasses and Privilege Escalation Dominate
Vypr Intelligence · Jun 16, 2026

Severity

MediumCVSS v3.1

6.5/ 10

CVSS v46.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack vector: Network
Complexity: Low
Privileges: Low
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected

Source repo: github.com/openclaw/openclaw

EPSS

Probability of exploitation in the next 30 days.

0.21%

VYPR risk score

Composite of severity, exploitation, and reach.

0.35medium

cvss	0.423
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000

Weaknesses

CWE-1023
Incomplete Comparison with Missing Factors
CWE-20
Improper Input Validation
CWE-918
Server-Side Request Forgery (SSRF)

CVE ID

CVE-2026-53859

Credits

N
nayakchinmohan
reporter · ghsa