CVE-2026-44981
Published:June 13, 2026
Updated:June 13, 2026
The LAPI router uses "gin-contrib/gzip" with "DefaultDecompressHandle" globally ("pkg/apiserver/controllers/controller.go"). This middleware decompresses incoming request bodies without enforcing a maximum decompressed size. The endpoints "/v1/watchers" or "/v1/watchers/login" require no authentication. An attacker can send small gzip-compressed JSON payloads that, when decompressed, result in hundreds of MB of valid JSON occupying server memory. Sending enough requests concurrently will cause LAPI to allocate excessive heap memory, leading the OS to forcibly terminate the process. This vulnerability is not exploitable from the network in default configurations, as LAPI only listens on the loopback interface. If developers' applications are using a multi-server setup, LAPI will be exposed in the network, in which case they are at risk if untrusted IPs can access it. Impact Exploiting this vulnerability will make LAPI unreachable, meaning that bouncers will not be able to fetch new decisions (but existing decisions will still be enforced) and log processors will not be able to send alerts, effectively denying the creation of new decisions. Workarounds If the LAPI is exposed on the network (either directly or through a reverse proxy), for example in the case of a multi-server deployment, restrict access to trusted IP addresses.
Affected Packages
https://github.com/crowdsecurity/crowdsec.git (GITHUB):
Affected version(s) >=v1.7.0 <v1.7.8Fix Suggestion:
Update to version v1.7.8github.com/crowdsecurity/crowdsec (GO):
Affected version(s) >=v1.7.0 <v1.7.8Fix Suggestion:
Update to version v1.7.8Related Resources (3)
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Contact UsCVSS v4
Base Score:
4.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
UNREPORTED
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Handling of Highly Compressed Data (Data Amplification)
EPSS
Base Score:
0.07