🛡️ CVE-2021-40812 on Ubuntu — libgd2

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

The GD Graphics Library (aka LibGD) through 2.3.2 has an out-of-bounds read because of the lack of certain gdGetBuf and gdPutBuf return value checks.

Distribution advisory

This page covers CVE-2021-40812 as tracked by Ubuntu, for the package libgd2. The fix is available in version 2.3.0-2ubuntu2.3; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

UBUNTU-CVE-2021-40812 is recorded against 1 package.

libgd2 (fixed in 2.3.0-2ubuntu2.3)

Timeline and source

Published on 8 September 2021 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
github.com (Report)
www.cve.org (Report)
ubuntu.com (Advisory)

CVE-2021-40812 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2021-09-08

Updated 2026-08-12

Modified 2026-04-22

Fix URL N/A

Affected Packages

Software	From version	Fixed in
libgd2	—	2.3.0-2ubuntu2.3

References

REPORT https://ubuntu.com/security/CVE-2021-40812

REPORT https://github.com/libgd/libgd/issues/750#issuecomment-914872385

REPORT https://www.cve.org/CVERecord?id=CVE-2021-40812

ADVISORY https://ubuntu.com/security/notices/USN-7112-1

🔗 NVD 🔗 Mitre

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