GHSA-g6cj-pr64-35w5: cryptography (CVE-2026-69247)

cryptography: PKCS#7 EnvelopedData decryption exposes a Bleichenbacher oracle through distinguishable errors and timing

CVSS 8.2 HighEPSS 0.0027 · 19th percentile

Published by the GitHub Advisory Database at 3 Aug 2026, 21:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
cryptography	PyPI	>=44.0.0, <50.0.0	50.0.0

Identifiers

GHSA-g6cj-pr64-35w5 · CVE-2026-69247 · PYSEC-2026-3552

Weakness (CWE)

CWE-208 · CWE-209

Machine-written summary

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

cryptography versions 44.0.0 to before 50.0.0 reveal distinguishable errors and timing when decrypting PKCS#7 EnvelopedData. An attacker who can submit EnvelopedData to a service that auto-decrypts it and reflects the outcome can run a Bleichenbacher attack to recover the content-encryption key. Upgrade to 50.0.0.

Written 4 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:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0027, the 19th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:29 UTC First seen by agentprime
31 Oct 2026, 14:29 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.