CVE-2024-26130 | cryptography NULL pointer deference with pkcs12.serialize_key_and_certificates when called with a non-matching certificate and private key and an hmac_hash override

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Starting in version 38.0.0 and prior to version 42.0.4, if `pkcs12.serialize_key_and_certificates` is called with both a certificate whose public key did not match the provided private key and an `encryption_algorithm` with `hmac_hash` set (via `PrivateFormat.PKCS12.encryption_builder().hmac_hash(...)`, then a NULL pointer dereference would occur, crashing the Python process. This has been resolved in version 42.0.4, the first version in which a `ValueError` is properly raised.

Published: 2024-02-21 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-26130 is rated Moderate Risk (48.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.83%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-26130

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.47% 0.83% +0.36%
2 2026-06-09 0.43% 0.47% +0.05%
3 2026-04-10 — 0.43% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-26130

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2024-26130

GitHub Security Advisory for CVE-2024-26130

GHSA-6vqw-3v5j-54x4 · Severity: high · Ecosystem: pip — cryptography NULL pointer dereference with pkcs12.serialize_key_and_certificates when called with a non-matching certificate and private key and an hmac_hash override

OS Trackers for CVE-2024-26130

vendor priority summary link
alpine — CVE-2024-26130: 1 source package rows (py3-cryptography); 6 state rows across 3 repos (3.22-community, edge-community, edge-main); fixed 0, open 6. https://security.alpinelinux.org/vuln/CVE-2024-26130
debian unimportant CVE-2024-26130 unimportant priority: Debian including 1 source packages (python-cryptography), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-26130
gentoo normal CVE-2024-26130: 1 GLSA(s) (202407-06), 1 atom(s) (dev-python/cryptography); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-26130
redhat high — https://access.redhat.com/security/cve/CVE-2024-26130
suse medium — https://www.suse.com/security/cve/CVE-2024-26130/
ubuntu medium CVE-2024-26130 medium priority: Ubuntu including 1 source packages (python-cryptography), 8 status rows across 8 suites (bionic, focal, jammy, mantic, noble, trusty, upstream, xenial): not-affected 4, released 2, DNE 1, needs-triage 1. https://ubuntu.com/security/CVE-2024-26130

Affected software / configurations for CVE-2024-26130

Vendor Product Version Raw CPE
cryptography.io cryptography >= 38.0.0, < 42.0.4 cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:*

References for CVE-2024-26130

cvelogic Threat Intelligence