High severity · published Mar 19, 2026
CVE-2026-28461
OpenClaw < 2026.3.1 - Unbounded Memory Growth in Zalo Webhook via Query String Key Churn
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenClaw · OpenClaw
before 2026.3.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28461
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28461
Mitigation
https://github.com/openclaw/openclaw/security/advisories/GHSA-wr6m-jg37-68xh
Third Party Advisory
https://www.vulncheck.com/advisories/openclaw-unbounded-memory-growth-in-zalo-webhook-via-query-string-key-churn
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