CVE-2023-37365

hnswlib Double Free vulnerability

6.5 MediumFix available

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.59%Up 0.5 points since Jul 1, 2023

What each source reports

NVD Score used 6.5

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: CVE-2023-37365
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-415
Updated: 2026-11-02

CVE List No score

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: CVE-2023-37365
Updated: 2026-11-02

EUVDEUVD-2023-1919 No score

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: EUVD-2023-1919
Updated: 2026-11-03

GitHub AdvisoriesGHSA-xwc8-rf6m-xr86 6.5

hnswlib Double Free vulnerability

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: GHSA-xwc8-rf6m-xr86
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-415
Updated: 2026-11-02

OSVDEBIAN-CVE-2023-37365 6.5

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: DEBIAN-CVE-2023-37365
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGHSA-xwc8-rf6m-xr86 6.5

hnswlib Double Free vulnerability

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: GHSA-xwc8-rf6m-xr86
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-415
Updated: 2026-11-02

OSVPYSEC-2026-1450 6.5

hnswlib Double Free vulnerability

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: PYSEC-2026-1450
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2023-37365 6.5

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: UBUNTU-CVE-2023-37365
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSV No score

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

Record: CVE-2023-37365
Updated: 2026-11-02

Affected products

hnswlib project hnswlib

Affected packages

Affected packages
Package	Affected	Fixed
`hnswlib` PyPI	before 0.8.0	0.8.0
`hnswlib` Debian:12	before 0.6.2-2+deb12u1, plus listed versions 0.6.2-2	0.6.2-2+deb12u1
`hnswlib` Debian:13	before 0.7.0-1	0.7.0-1
`hnswlib` Debian:14	before 0.7.0-1	0.7.0-1
`hnswlib` PyPI	before 0.8.0, plus listed versions 0.3.2.00.3.40.4.00.5.00.5.1 Show 5 moreShow less 0.5.20.6.00.6.10.6.20.7.0	0.8.0
`hnswlib` Ubuntu:22.04:LTS	All versions, plus listed versions 0.4.0-3build10.5.2-10.6.0-10.6.2-10.6.2-1build1	None known
`hnswlib` Ubuntu:24.04:LTS	All versions, plus listed versions 0.7.0-10.7.0-20.7.0-2build10.8.0-10.8.0-1build1	None known
`hnswlib` Ubuntu:25.10	All versions, plus listed versions 0.8.0-1build3	None known
`hnswlib` Ubuntu:26.10	All versions, plus listed versions 0.8.0-1build50.9.0-2	None known
`hnswlib` Ubuntu:26.04:LTS	All versions, plus listed versions 0.8.0-1build30.8.0-1build40.8.0-1build5	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2023-37365 is a medium vulnerability (CVSS 6.5) in Hnswlib Project Hnswlib, published June 30, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in hnswlib 0.8.0.

References

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