CVE-2023-49083 | cryptography vulnerable to NULL-dereference when loading PKCS7 certificates

Exp

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.

Published: 2023-11-29 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-49083 is rated Exploit Available (58.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.98%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2023-49083

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-49083

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 1.26% 0.98% -0.27%
2 2026-05-25 0.99% 1.26% +0.27%
3 2026-05-13 — 0.99% —

Full EPSS history (33 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-49083

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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.
 2.2 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-2023-49083

GitHub Security Advisory for CVE-2023-49083

GHSA-jfhm-5ghh-2f97 · Severity: medium · Ecosystem: pip — cryptography vulnerable to NULL-dereference when loading PKCS7 certificates

OS Trackers for CVE-2023-49083

vendor priority summary link
alpine — CVE-2023-49083: 1 source package rows (py3-cryptography); 14 state rows across 4 repos (3.18-community, 3.22-community, edge-community, edge-main); fixed 0, open 14. https://security.alpinelinux.org/vuln/CVE-2023-49083
debian not yet assigned CVE-2023-49083 not yet assigned 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-2023-49083
gentoo normal CVE-2023-49083: 1 GLSA(s) (202407-06), 1 atom(s) (dev-python/cryptography); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-49083
redhat medium — https://access.redhat.com/security/cve/CVE-2023-49083
suse medium CVE-2023-49083 severity moderate: SUSE including 263 source package names (2.5.3-61.1:python3-cryptography-3.3.2-150400.23.1, 5.0.0-beta1.2.122:python3-cryptography-3.3.2-150400.23.1, …), 601 product×package rows across 303 product lines (Container bci/kiwi, Container suse/389-ds, … (303 product lines)): Fixed 376, Known Affected 197, Known Not Affected 22, Will Not Fix 6. https://www.suse.com/security/cve/CVE-2023-49083/
ubuntu medium CVE-2023-49083 medium priority: Ubuntu including 1 source packages (python-cryptography), 8 status rows across 8 suites (bionic, focal, jammy, lunar, mantic, trusty, upstream, xenial): not-affected 3, released 3, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2023-49083

Affected software / configurations for CVE-2023-49083

Vendor Product Version Raw CPE
cryptography.io cryptography >= 3.1, < 41.0.6 cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:*

References for CVE-2023-49083

cvelogic Threat Intelligence