CVE-2021-40145: gdImageGd2Ptr in gd_gd2.c in the GD Graphics Library (aka LibGD) through 2.3.2 has a double free

Q: How do I fix CVE-2021-40145?

libgd: upgrade to newer than 2.3.2. Exact commands for each OS are on this page.

Q: Is CVE-2021-40145 being exploited?

CVE-2021-40145 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-40145 affect?

CVE-2021-40145 affects libgd. Severity is high (CVSS 7.5). gdImageGd2Ptr in gd_gd2.c in the GD Graphics Library (aka LibGD) through 2.3.2 has a double free. NOTE: the vendor's position is "The GD2 image format is a proprietary image format of libgd. It has to be regarded as being obsolete, and shou

Q: How urgent is CVE-2021-40145?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2021-40145 is a high-severity flaw (CVSS 7.5) affecting libgd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

gdImageGd2Ptr in gd_gd2.c in the GD Graphics Library (aka LibGD) through 2.3.2 has a double free. NOTE: the vendor's position is "The GD2 image format is a proprietary image format of libgd. It has to be regarded as being obsolete, and should only be used for development and testing purposes.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-415
Published	2021-08-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libgd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-08-26 01:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

libgd libgd UPGRADE

Affected: <= 2.3.2

Fixed in: newer than 2.3.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libgd || rpm -q libgd || libgd --version

2. UPGRADE to newer than 2.3.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade libgd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libgd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-40145?

libgd: upgrade to newer than 2.3.2. Exact commands for each OS are on this page.

Is CVE-2021-40145 being exploited?

CVE-2021-40145 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-40145 affect?

CVE-2021-40145 affects libgd. Severity is high (CVSS 7.5). gdImageGd2Ptr in gd_gd2.c in the GD Graphics Library (aka LibGD) through 2.3.2 has a double free. NOTE: the vendor's position is "The GD2 image format is a proprietary image format of libgd. It has to be regarded as being obsolete, and shou

How urgent is CVE-2021-40145?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2021-38115 MEDIUM 6.5 UPGRADE read_header_tga in gd_tga.c in the GD Graphics Library (aka LibGD) through 2.3.2 allows remote attackers to ca

References

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