What’s Vulnerable › Vulnerabilities

CVE-2026-28461: OpenClaw < 2026.3.1 - Unbounded Memory Growth in Zalo Webhook via Query String Key Churn

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-19 · updated 2026-06-17
• Weakness: CWE-770

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.

Affected products

• OpenClaw: before 2026.3.1 — fixed in 2026.3.1

How to fix

Upgrade to a fixed version: OpenClaw 2026.3.1. Check the vendor advisory for mitigations.

References

• https://github.com/openclaw/openclaw/security/advisories/GHSA-wr6m-jg37-68xh
• https://www.vulncheck.com/advisories/openclaw-unbounded-memory-growth-in-zalo-webhook-via-query-string-key-churn

Get alerted when CVE-2026-28461 or the next vulnerability affects your stack