GHSA-r6ph-v2qm-q3c2: cryptography (CVE-2026-26007)

Package	Ecosystem	Affected	Fixed in
cryptography	PyPI	<46.0.5	46.0.5

Machine-written summary

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

The cryptography Python package before 46.0.5 does not check that elliptic curve public key points lie in the prime-order subgroup, but only SECT curves are affected. An attacker who can supply a public key, for example to a service that loads it, can leak information about a victim's private key during ECDH and forge ECDSA signatures on the small subgroup. Upgrade cryptography to version 46.0.5 or later.

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
8.2	High	4.0	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0039, the 33rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:11 UTC First seen by agentprime
31 Oct 2026, 14:11 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.