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CVE-2026-106442 high CVSS 7.8

Vulnerability in hydra-core (CVE-2026-106442)

Summary

Vulnerability in hydra-core (CVE-2026-106442). Successful exploitation can lead to full system takeover. Exploitable via _target_. Mitigation: upgrade to 1.4.0.dev9 or later.

Original description

The description as published by the source.

Summary

Hydra's instantiate() API resolves and invokes Python callables named by the _target_ field in configuration. The target blacklist introduced for CVE-2026-68508 was incomplete.

Representative bypasses included execution wrappers such as timeit.timeit, executable deserialization through pickle.loads, and generic dispatch or wrapper targets that obscured the effective callable. Target aliases, callable-returning helpers, and deferred dispatch could similarly bypass name-based checks.

An attacker who can cause an application to instantiate an untrusted Hydra configuration can use these gaps to execute code with the application's privileges.

Fix

Hydra 1.3.6 expands and hardens the blacklist used by the 1.3 compatibility line. It blocks the reported execution and deserialization surfaces, checks canonical callable identities and aliases, mediates callable results, and blocks generic dispatch and wrapper targets that bypass immediate target checks.

The Hydra 1.3 blacklist is a best-effort, defense-in-depth measure. It is not a complete security boundary and does not make untrusted configuration safe to instantiate.

Hydra 1.4.0.dev9 applies the same hardening and introduces the execution whitelist as the recommended primary security boundary. When a whitelist is supplied, targets are rejected unless trusted Python code authorizes them. If no whitelist is supplied, Hydra preserves legacy behavior with a deprecation warning and the blacklist as a best-effo…

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-2026-106442 has been found in hydra-core.
Attackers can target a specific entry point like _target_ over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade hydra-core to 1.4.0.dev9 or later.
If unsure, ask your IT team or search "hydra-core CVE-2026-106442" on the vendor's site.

CVE-2026-106442 (hydra-core) — CWE-184 / CVSS v3 7.8
Attack vector: local / unauthenticated
Attack surface: _target_ / timeit.timeit / pickle.loads
Patched: 1.4.0.dev9 — 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-184) exists in hydra-core. Attackers reach the vulnerable code path via _target_ without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of hydra-core. Attack surface: _target_ / timeit.timeit / pickle.loads.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 1.4.0.dev9.

🛡️ 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 'hydra-core' . 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 'hydra-core' . | 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 hydra-core 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 hydra-core to 1.4.0.dev9

    ステージング環境で 1.4.0.dev9 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

pip hydra-core
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.0.dev9"}]}]

References

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