Vulnerability in github.com/crowdsecurity/crowdsec (CVE-2026-44981)
Summary
Vulnerability in github.com/crowdsecurity/crowdsec (CVE-2026-44981). Risk of unauthorized operations or information disclosure. Exploitable via DefaultDecompressHandle. Mitigation: upgrade to 1.7.8 or later.
Original description
The description as published by the source.
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: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-44981 has been found in github.com/crowdsecurity/crowdsec.
Attackers can target a specific entry point like DefaultDecompressHandle over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/crowdsecurity/crowdsec to 1.7.8 or later.
If unsure, ask your IT team or search "github.com/crowdsecurity/crowdsec CVE-2026-44981" on the vendor's site.
CVE-2026-44981 (github.com/crowdsecurity/crowdsec) — CWE-409
Attack surface: DefaultDecompressHandle
Patched: 1.7.8 — apply immediately
Workaround: 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.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-409) exists in github.com/crowdsecurity/crowdsec. Attackers reach the vulnerable code path via DefaultDecompressHandle.
Check the vendor advisory for the affected versions of github.com/crowdsecurity/crowdsec. Attack surface: DefaultDecompressHandle.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.7.8.
Workaround: 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.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/crowdsecurity/crowdsec' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'github.com/crowdsecurity/crowdsec' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
github.com/crowdsecurity/crowdsecを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
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.パッチが適用されるまでの応急処置として、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. を実施。回避策の副作用 (機能低下) を確認した上で。
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3Apply patch patch
Upgrade github.com/crowdsecurity/crowdsec to 1.7.8ステージング環境で 1.7.8 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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4Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2026-44981 crowdsec
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- patch github.com
- web github.com
- web github.com