Vulnerability in hydra-core (CVE-2026-106439)
Summary
Vulnerability in hydra-core (CVE-2026-106439). Risk of unauthorized operations or information disclosure. Exploitable via _target_. Mitigation: upgrade to 1.4.0.dev10 or later.
Original description
The description as published by the source.
Summary
Hydra's legacy instantiate() target blocklists and related execution-policy
collections are stored in mutable module-level state. Because _locate() can
resolve attributes on imported objects, a configuration can resolve a mutation
method such as .discard(), modify the active policy, and then instantiate a
target that would otherwise be blocked.
Impact
A configuration controlling multiple sibling _target_ entries can first
remove an entry from a target blocklist and then invoke the removed target.
Sibling nodes are processed in insertion order and consult the same mutable
module-level policy.
This affects the legacy/default path without an execution whitelist. The 1.3
blocklist is a defense-in-depth measure rather than a complete security
boundary, and applications must not treat arbitrary untrusted configuration as
safe to instantiate or use for Python logging configuration.
Released hydra-core versions 1.3.4 through 1.3.6 and 1.4.0.dev4 through
1.4.0.dev9 are affected. Fixed releases are 1.3.7 and 1.4.0.dev10.
The reported direct mutation path does not bypass an execution whitelist
restricted to intended application targets and supplied by trusted Python
code. During remediation, Hydra additionally hardened generic discovery,
dispatch, introspection, alias, callable-result, and deferred-callable paths
that could otherwise undermine name-only authorization.
Technical details
In hydra-core 1.3.4 and 1.3.5, the mutable blocklist is reachable…
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-2026-106439 has been found in hydra-core.
Attackers can target a specific entry point like _target_ over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade hydra-core to 1.4.0.dev10 or later.
If unsure, ask your IT team or search "hydra-core CVE-2026-106439" on the vendor's site.
CVE-2026-106439 (hydra-core) — CWE-470
Attack surface: _target_ / hydra._internal.target_policy / set.discard / finally
Patched: 1.4.0.dev10 — 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.
A vulnerability (CWE-470) exists in hydra-core. Attackers reach the vulnerable code path via _target_.
Check the vendor advisory for the affected versions of hydra-core. Attack surface: _target_ / hydra._internal.target_policy / set.discard / finally.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.4.0.dev10.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
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
-
1Identify 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。 -
2Apply patch patch
Upgrade hydra-core to 1.4.0.dev10ステージング環境で 1.4.0.dev10 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。
-
3Post-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
References
- web github.com
- web github.com
- web github.com
- web github.com
- web nvd.nist.gov
- web github.com