Answer in brief
CVE-2026-106439 records a High severity (CVSS 8.5) vulnerability in Hydra: Mutable instantiate policy sets allow target blocklist bypass. The current sources do not mark it as known exploited. The current feed maps hydra-ecosystem/hydra (generic), hydra-core (pip), hydra-core (pip). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps hydra-ecosystem/hydra (generic), hydra-core (pip), hydra-core (pip). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| hydra-ecosystem/hydrageneric | >=1.3.4 <1.3.7 || >=1.4.0.dev4 <1.4.0.dev10 | 1.3.7, 1.4.0.dev10 |
| hydra-corepip | >=1.3.4,<1.3.7 | 1.3.7 |
| hydra-corepip | >=1.4.0.dev4,<1.4.0.dev10 | 1.4.0.dev10 |
Published upstream
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 6, 2026
Hydra is a framework for elegantly configuring complex applications. From 1.3.4 until 1.3.7 and 1.4.0.dev10, Hydra stores legacy instantiate target blocklists and related execution-policy collections in mutable module-level state. An attacker who controls multiple sibling target entries can resolve hydra._internal.target_policy.UNCONTROLLED_EXECUTION_TARGETS.discard through instantiate(), remove a denied target, and then invoke that target because sibling nodes are processed in insertion order against the same modified policy. The mutation persists in process-global state and can enable code execution with the application's privileges, while a narrow execution whitelist supplied by trusted Python code is not bypassed by the reported direct mutation path. This issue is fixed in versions 1.3.7 and 1.4.0.dev10.
Quoted source text, attributed separately from HOL analysis.