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High 7.6

Use-After-Free in libsoup

CVE-2026-85197 First seen on SecPulse

Summary

Vulnerability in libsoup (CVE-2026-85197). Risk of unauthorized operations or information disclosure.

AI summary

Produced by SecPulse using an external AI model; it may contain mistakes. Check the original description and references below before acting on it.

A vulnerability tracked as CVE-2026-85197 has been found in libsoup.
Risk of unauthorized operations or information disclosure. CVSS score: 7.6/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "libsoup CVE-2026-85197" on the vendor's site.

CVE-2026-85197 (libsoup) — CWE-416 / CVSS v3 7.6
Attack vector: remote (network-reachable) / unauthenticated
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.

What is the problem

Use-after-free (CWE-416) exists in libsoup.

Affected scope

Check the vendor advisory for the affected versions of libsoup.

Severity

Severity: High (CVSS 7.6/10). Risk of unauthorized operations or information disclosure.

How to fix

Update to the patched release per vendor advisory.

Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'libsoup' . 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

  1. 1
    Identify exposureidentify
    grep -r 'libsoup' . | 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 libsoup を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Post-deployment verificationverify
    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。

Fix status by distribution

Records published by each distribution for this CVE. Fixed versions differ by release; check each link.

Original description The description as published by the source.

A flaw was found in libsoup. A malicious HTTP/2 server or a Man-in-the-Middle (MITM) attacker can exploit a heap use-after-free vulnerability in the HTTP/2 client implementation. This occurs when a GNOME application uploads a file using HTTP/2, and the server sends a GOAWAY frame while the file body is being read asynchronously. This can lead to memory corruption, potentially resulting in information disclosure or arbitrary code execution.

Source: NIST National Vulnerability Database NVD GitHub Advisory

References

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