CVE-2024-26130Network attack vector

Python process crash via unchecked PKCS12 creation

Published Feb 21, 2024 · Updated Aug 14, 2024

NULL pointer dereference in cryptography 38.0.0 through 42.0.3 allows attackers to crash a Python process during PKCS#12 serialization. The OpenSSL backend fails to check whether PKCS12_create returned NULL for a mismatched certificate and private key before applying an overridden HMAC hash. The calling application must pass both mismatched key material and a PKCS#12 encryption algorithm with hmac_hash set; the impact is limited to termination of that Python process.

CVSS severity7.5
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in cryptography 38.0.0 through 42.0.3 allows attackers to crash a Python process during PKCS#12 serialization. The OpenSSL backend fails to check whether PKCS12_create returned NULL for a mismatched certificate and private key before applying an overridden HMAC hash. The calling application must pass both mismatched key material and a PKCS#12 encryption algorithm with hmac_hash set; the impact is limited to termination of that Python process.

The record

CVE
CVE-2024-26130
Published
Feb 21, 2024
Updated
Aug 14, 2024
Vendor
Python Cryptographic Authority
Product
cryptography
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 2024Record 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=>= 38.0.0, < 42.0.4
  2. Affected versionversion=38.0.0 <42.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Python Cryptographic Authority · cryptographyversion=>= 38.0.0, < 42.0.4; version=38.0.0 <42.04

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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