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CVE-2026-44981— CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression

Quick assessment

Affected
crowdsecurity crowdsec
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

crowdsec CrowdSec是crowdsec团队开源的一款协作式安全防护引擎，提供众包服务器检测和恶意 IP 防护。 CrowdSec 1.7.0版本至1.7.8之前版本存在资源管理错误漏洞，该漏洞源于LAPI路由器全局使用gin-contrib/gzip的DefaultDecompressHandle，未对未加密的gzip压缩JSON请求体强制执行最大解压缩大小，导致堆分配过度，可能使LAPI不可达。

AI Predicted 7.5 Difficulty: Easy EPSS 0.51% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
crowdsecurity crowdsec >= 1.7.0, < 1.7.8 affected
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I. Basic Information for CVE-2026-44981

Vulnerability Information
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Vulnerability Title
CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
CrowdSec 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
crowdsec CrowdSec是crowdsec团队开源的一款协作式安全防护引擎，提供众包服务器检测和恶意 IP 防护。 CrowdSec 1.7.0版本至1.7.8之前版本存在资源管理错误漏洞，该漏洞源于LAPI路由器全局使用gin-contrib/gzip的DefaultDecompressHandle，未对未加密的gzip压缩JSON请求体强制执行最大解压缩大小，导致堆分配过度，可能使LAPI不可达。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
crowdsecurity crowdsec >= 1.7.0, < 1.7.8 -

II. Public POCs for CVE-2026-44981

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III. Intelligence Information for CVE-2026-44981

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Patches & Fixes for CVE-2026-44981 (2)

Vendor Advisories for CVE-2026-44981 (1)

IV. Related Vulnerabilities

Same product: crowdsec
Same vendor: crowdsecurity
Same weakness: CWE-409

V. Comments for CVE-2026-44981

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