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PYSEC-2026-3552 cryptography: PKCS#7 EnvelopedData decryption exposes a Bleichenbacher oracle through distinguishable errors and timing

🗓️ 04 Aug 2026 11:34:47Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 2 Views

PKCS7 EnvelopedData decryption exposed a Bleichenbacher oracle via distinguishable errors; fixed by RFC 3218.

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04 Aug 2026 14:30Current
5.4Medium risk
Vulners AI Score5.4
CVSS 48.2
EPSS0.00175
2