CVE-2026-28461 OpenClaw < 2026.3.1 - Unbounded Memory Growth in Zalo Webhook via Query String Key Churn
Unauthenticated attackers can cause denial of service in OpenClaw by sending repeated Zalo webhook requests with varying query strings to exhaust memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-28461?
CVE-2026-28461 is a high-severity denial of service vulnerability in Openclaw Openclaw, published on 19 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OpenClaw versions prior to 2026.3.1 contain an unbounded memory growth vulnerability in the Zalo webhook endpoint that allows unauthenticated attackers to trigger in-memory key accumulation by varying query strings. Remote attackers can exploit this by sending repeated requests with different query parameters to cause memory pressure, process instability, or out-of-memory conditions that degrade service availability.
Weakness: CWE-770
Which versions are affected by CVE-2026-28461?
It affects 1 product.
Products include Openclaw Openclaw.
How do I fix CVE-2026-28461?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-28461 being exploited?
There is no known exploitation of CVE-2026-28461 in the wild and no public exploit code.
Other vulnerabilities in Openclaw Openclaw
- CVE-2026-28363 Security feature bypass in OpenClaw
- CVE-2026-30741 Code injection in n/a
- CVE-2026-33579 OpenClaw < 2026.3.28 - Privilege Escalation via Missing Caller Scope Validation in Device Pair Approval
- CVE-2026-32922 OpenClaw < 2026.3.11 - Privilege Escalation via Unvalidated Scope in device.token.rotate
- CVE-2026-32978 OpenClaw < 2026.3.11 - Approval Bypass via Unrecognized Script Runners
Sources
Also known as GHSA-vfw9-h883-6h9x, MINI-q4gw-2w2g-h57p.