GHSA-q445-7m23-qrmw

openssl's `MemBio::get_buf` has undefined behavior with empty buffers

6.9 MediumFix available

Previously, MemBio::get_buf called slice::from_raw_parts with a null-pointer, which violates the functions invariants, leading to undefined behavior. In debug builds this would produce an assertion failure. This is now fixed.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: Low
Availability: Low

What each source reports

GitHub Advisories Score used6.9

openssl's `MemBio::get_buf` has undefined behavior with empty buffers

Record: GHSA-q445-7m23-qrmw
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness: CWE-476
Updated: 2026-11-02

OSV6.9

openssl's `MemBio::get_buf` has undefined behavior with empty buffers

Record: GHSA-q445-7m23-qrmw
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness: CWE-476
Updated: 2026-11-02

OSVRUSTSEC-2024-0357No score

`MemBio::get_buf` has undefined behavior with empty buffers

Record: RUSTSEC-2024-0357
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`openssl` crates.io	before 0.10.66	0.10.66
`openssl` crates.io	0.0.0-0 up to 0.10.66	0.10.66

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	GitHub Advisories, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

GHSA-q445-7m23-qrmw is a medium vulnerability (CVSS 6.9) in openssl, published July 21, 2024. No source lists public exploit code. Fixed in openssl 0.10.66.