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CVE-2026-40194
low
CVSS 3.7
Vulnerability in phpseclib/phpseclib (CVE-2026-40194)
Summary
vulnerability in phpseclib/phpseclib (CVE-2026-40194). Risk of unauthorized operations or information disclosure. Exploitable via ``e819a163c``. Mitigation: upgrade to `1.0.28` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-40194** has been found in phpseclib/phpseclib.
Attackers can target a specific entry point like ``e819a163c`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 3.7/10.
What to do: upgrade phpseclib/phpseclib to **1.0.28** or later.
If unsure, ask your IT team or search "phpseclib/phpseclib CVE-2026-40194" on the vendor's site.
CVE-2026-40194 (phpseclib/phpseclib) — CWE-208 / CVSS v3 3.7
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `e819a163c` / `master` / `memcmp` / `arcfour`
Patched: `1.0.28` — 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 phpseclib/phpseclib. Attackers reach the vulnerable code path via ``e819a163c`` without authentication.
📍 Affected scope
phpseclib/phpseclib — . Attack surface: `e819a163c` / `master` / `memcmp` / `arcfour`.
🔥 Severity
Severity: Low (CVSS 3.7/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.0.28**.
🛡️ 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 'phpseclib/phpseclib' .` 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
-
1Identify exposure identify
grep -r 'phpseclib/phpseclib' . | 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 `phpseclib/phpseclib` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade phpseclib/phpseclib to 1.0.28ステージング環境で 1.0.28 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
phpseclib/phpseclib
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.28"}]}]
Packagist
phpseclib/phpseclib
[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.0.51"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-40194
- package https://github.com/phpseclib/phpseclib
- web https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac
- web https://github.com/phpseclib/phpseclib/releases/tag/1.0.28
- web https://github.com/phpseclib/phpseclib/releases/tag/2.0.53
- web https://github.com/phpseclib/phpseclib/releases/tag/3.0.51
- web https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx
- web https://github.com/advisories/GHSA-r854-jrxh-36qx