OpenClaw versions prior to 2026.2.14 decode base64-backed media inputs into buffers before enforcing decoded-size budget limits, allowing attackers to trigger large memory allocations. Remote attackers can supply oversized base64 payloads to cause memory pressure and denial of service.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/openclaw/openclaw/commit/31791233d60495725fa012745dde8d6ee69…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/security/advisories/GHSA-w2cg-vxx6-5xjg
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-large-base-…
disclosure@vulncheck.com