GHSA-rqx7-p7vv-w7hr: hydra-core (CVE-2026-106442)

Package	Ecosystem	Affected	Fixed in
hydra-core	PyPI	>=1.3.4, <1.3.6 \|\| >=1.4.0.dev0, <1.4.0.dev9	1.3.6, 1.4.0.dev9

Machine-written summary

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

Hydra (hydra-core) versions 1.3.4 up to but not including 1.3.6, and 1.4.0.dev0 up to but not including 1.4.0.dev9, have an incomplete blacklist for the target callables that instantiate() runs. An attacker who can get an application to instantiate an untrusted Hydra configuration can bypass the blacklist and execute code with the application's privileges. Upgrade to hydra-core 1.3.6 or 1.4.0.dev9 or later. On Hydra 1.3, do not instantiate configuration from untrusted sources; on 1.4 and later, restrict untrusted configuration with a trusted execution whitelist.

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
7.8	High	3.1	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0016, the 5th percentile, on 5 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.