GHSA-mwj6-rfh8-7qf4: hydra-core (CVE-2026-106439)

Package	Ecosystem	Affected	Fixed in
hydra-core	PyPI	>=1.3.4, <1.3.7 \|\| >=1.4.0.dev4, <1.4.0.dev10	1.3.7, 1.4.0.dev10

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Hydra (hydra-core) versions 1.3.4 to before 1.3.7 and 1.4.0.dev4 to before 1.4.0.dev10 store their instantiate target blocklists in mutable module-level state, so a configuration that can resolve and call a set-mutation method can remove a blocked target and then instantiate it. An attacker who can supply untrusted configuration can thereby run targets that would otherwise be blocked. Upgrade to hydra-core 1.3.7 or 1.4.0.dev10, and do not pass untrusted configuration to instantiate(); the advisory describes no separate fix for the 1.3 line.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.5	High	4.0	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0046, the 39th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:08 UTC First seen by agentprime
31 Oct 2026, 14:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.