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CVE-2026-54736
Vulnerability in phalcon/cphalcon (CVE-2026-54736)
Summary
vulnerability in phalcon/cphalcon (CVE-2026-54736). Risk of unauthorized operations or information disclosure. Exploitable via ``useSigning``. Mitigation: upgrade to `5.14.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-54736** has been found in phalcon/cphalcon.
Attackers can target a specific entry point like ``useSigning`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade phalcon/cphalcon to **5.14.1** or later.
If unsure, ask your IT team or search "phalcon/cphalcon CVE-2026-54736" on the vendor's site.
CVE-2026-54736 (phalcon/cphalcon) — CWE-208 /
Attack surface: `useSigning` / `memcmp` / `zephir_hash_equals` / `ZEPHIR_IS_IDENTICAL`
Patched: `5.14.1` — 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
**A vulnerability** (CWE-208) exists in phalcon/cphalcon. Attackers reach the vulnerable code path via ``useSigning`` without authentication.
📍 Affected scope
phalcon/cphalcon — . Attack surface: `useSigning` / `memcmp` / `zephir_hash_equals` / `ZEPHIR_IS_IDENTICAL`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **5.14.1**.
🛡️ 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 'phalcon/cphalcon' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'phalcon/cphalcon' . | 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 `phalcon/cphalcon` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade phalcon/cphalcon to 5.14.1ステージング環境で 5.14.1 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と、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
composer
phalcon/cphalcon
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.1"}]}]
References
- web https://github.com/phalcon/cphalcon/commit/ad53ab1b2e7ec59b3af92b0b37b8aaa099011137
- web https://github.com/phalcon/cphalcon/issues/17090
- web https://github.com/phalcon/cphalcon/pull/17091
- web https://github.com/phalcon/cphalcon/releases/tag/v5.14.1
- web https://github.com/phalcon/cphalcon/security/advisories/GHSA-8jqh-95g6-7jpj
- web https://nvd.nist.gov/vuln/detail/CVE-2026-54736
- web https://github.com/advisories/GHSA-8jqh-95g6-7jpj