CVE-2021-39432: diplib v3.0.0 is vulnerable to Double Free.

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MEDIUM 6.5DOWNGRADE

CVE-2021-39432 is a medium-severity flaw (CVSS 6.5) affecting diplib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

diplib v3.0.0 is vulnerable to Double Free.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-415, CWE-416
Published	2022-11-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: diplib

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

Am I affected?

Timeline

2022-11-04 17:15 UTCPublished CVE record published
2026-06-17 04:03 UTCUpdated Record last modified

diplib diplib DOWNGRADE

Affected: 3.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison diplib sudo apt install diplib=<VERSION_BEFORE_3.0.0> sudo apt-mark hold diplib

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list diplib sudo dnf downgrade diplib-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add diplib

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-39432?

diplib: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-39432 being exploited?

CVE-2021-39432 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-2021-39432 affect?

CVE-2021-39432 affects diplib. Severity is medium (CVSS 6.5). diplib v3.0.0 is vulnerable to Double Free.

How urgent is CVE-2021-39432?

Priority 41/100. Public exploit reference

References

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