GHSA-jpxq-7h8p-2q76: joserfc (CVE-2026-119283)

Package	Ecosystem	Affected	Fixed in
joserfc	PyPI	<1.7.5	1.7.5

Machine-written summary

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

The joserfc Python package, versions before 1.7.5, does not limit the number of entries in the recipients array of a JWE General JSON document passed to decrypt_json(). An unauthenticated remote attacker who can get such a document to an endpoint that decrypts it with an RSA key can force many RSA private-key operations from a small request, exhausting CPU and degrading availability. The documented verify_all_recipients=False option does not reduce this cost. Upgrade to joserfc 1.7.5, which is listed as the fixed version.

Written 31 Oct 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
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0023, the 13th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:07 UTC First seen by agentprime
31 Oct 2026, 14:07 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.