CVE-2026-44981CWE-409

CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression

High · published July 16, 2026

CVSS v4.0
8.2
EPSS
1%
Percentile
42.3
In the wild
Unconfirmed
What it is

CrowdSec offers crowdsourced protection against malicious IPs. From 1.7.0 until 1.7.8, the LAPI router used gin-contrib/gzip with DefaultDecompressHandle globally in pkg/apiserver/controllers/controller.go, causing /v1/watchers and /v1/watchers/login to decompress unauthenticated gzip-compressed JSON request bodies without enforcing a maximum decompressed size and allowing excessive heap allocation that can make LAPI unreachable. This issue is fixed in version 1.7.8.

The record
Technical detail
CVSS v4.0
8.2 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00507 · 42.3th percentile
Weakness
CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)
Published
2026-07-16T19:47Z
EPSS history
Timeline
  • 16 JUL 19:47Z
    CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression
    cvelistv5