CVE-2026-69247Network attack vector

Content-key disclosure via distinguishable PKCS#7 decryption failures

Published Aug 3, 2026 · Updated Aug 3, 2026

Information disclosure in cryptography 44.0.0 through 49.0.0 allows remote attackers to recover PKCS#7 content-encryption keys. The PKCS#7 decryptors expose RSA PKCS#1 v1.5 padding and recovered-key-length outcomes through distinct errors and timing rather than one uniform failure path. Exploitation requires a high-volume adaptive service that decrypts attacker-supplied EnvelopedData for a victim certificate; one error case also requires a backend without implicit rejection.

CVSS severity8.2
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in cryptography 44.0.0 through 49.0.0 allows remote attackers to recover PKCS#7 content-encryption keys. The PKCS#7 decryptors expose RSA PKCS#1 v1.5 padding and recovered-key-length outcomes through distinct errors and timing rather than one uniform failure path. Exploitation requires a high-volume adaptive service that decrypts attacker-supplied EnvelopedData for a victim certificate; one error case also requires a backend without implicit rejection.

The record

CVE
CVE-2026-69247
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Python Cryptographic Authority
Product
cryptography
Classifications
CWE-208, CWE-209, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 44.0.0, < 50.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Python Cryptographic Authority · cryptographyversion=>= 44.0.0, < 50.0.0

Published CVSS scores

8.2GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-208Observable Timing Discrepancy
CWE-209Generation of Error Message Containing Sensitive Information
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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