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CVE-2026-6722 critical CVSS 9.8

Use-After-Free in libphp (CVE-2026-6722)

Summary

Vulnerability in libphp (CVE-2026-6722). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 8.2.31, 8.3.31, 8.4.21, 8.5.6 or later.

Original description

The description as published by the source.

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOAP extension's object deduplication mechanism stores pointers to PHP objects in a global map without incrementing their reference counts. When an apache:Map node contains duplicate keys, processing the second entry overwrites the first in the temporary result map, freeing the original PHP object while its stale pointer remains in the map. A subsequent href reference to the freed node can copy the dangling pointer into the result. As PHP string allocations can reclaim the freed memory region, an attacker with control over the SOAP request body can exploit this use-after-free to achieve remote code execution.

Source: NIST National Vulnerability Database NVD

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-2026-6722 has been found in libphp.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: upgrade libphp to 8.2.31, 8.3.31, 8.4.21, 8.5.6 or later.
If unsure, ask your IT team or search "libphp CVE-2026-6722" on the vendor's site.

CVE-2026-6722 (libphp) — CWE-416 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 8.2.31, 8.3.31, 8.4.21, 8.5.6 — 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.

❓ What is the problem

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

📍 Affected scope

Check the vendor advisory for the affected versions of libphp.

🔥 Severity

Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 8.2.31, 8.3.31, 8.4.21, 8.5.6.

🛡️ 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 'libphp' . 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 exposure identify 
    grep -r 'libphp' . | 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 libphp 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
    Apply patch patch 
    Upgrade libphp to 8.2.31, 8.3.31, 8.4.21, 8.5.6

    ステージング環境で 8.2.31, 8.3.31, 8.4.21, 8.5.6 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。

  3. 3
    Post-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

Bitnami libphp
[{"type":"SEMVER","events":[{"introduced":"8.2.0"},{"fixed":"8.2.31"},{"introduced":"8.3.0"},{"fixed":"8.3.31"},{"introduced":"8.4.0"},{"fixed":"8.4.21"},{"introduced":"8.5.0"},{"fixed":"8.5.6"}]}]
Bitnami php
[{"type":"SEMVER","events":[{"introduced":"8.2.0"},{"fixed":"8.2.31"},{"introduced":"8.3.0"},{"fixed":"8.3.31"},{"introduced":"8.4.0"},{"fixed":"8.4.21"},{"introduced":"8.5.0"},{"fixed":"8.5.6"}]}]
Bitnami php-min
[{"type":"SEMVER","events":[{"introduced":"8.2.0"},{"fixed":"8.2.31"},{"introduced":"8.3.0"},{"fixed":"8.3.31"},{"introduced":"8.4.0"},{"fixed":"8.4.21"},{"introduced":"8.5.0"},{"fixed":"8.5.6"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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