Vulnerability in compression (CVE-2026-87776)
Summary
Vulnerability in compression (CVE-2026-87776). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 1.8.2 or later.
Original description
The description as published by the source.
Impact
A vulnerability in compression < 1.8.2 allows an attacker to trigger a Denial of Service (DoS) by disconnecting while a compressed response is being sent. When the client aborts the connection before the response finishes, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. Repeated aborted requests can exhaust available memory. All applications using compression are affected.
Patches
Users should upgrade to 1.8.2.
Workarounds
None.
Source: NIST National Vulnerability Database 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-2026-87776 has been found in compression.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade compression to 1.8.2 or later.
If unsure, ask your IT team or search "compression CVE-2026-87776" on the vendor's site.
CVE-2026-87776 (compression) — CWE-401 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 1.8.2 — apply immediately
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-401) exists in compression.
Check the vendor advisory for the affected versions of compression.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 1.8.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'compression' . 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
-
1Identify exposure identify
grep -r 'compression' . | 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
compressionを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade compression to 1.8.2ステージング環境で 1.8.2 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。
-
3Post-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
References
- web cna.openjsf.org
- web github.com
- web nvd.nist.gov
- web github.com
- web github.com
- web github.com