CVE-2021-44335: David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow

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HIGH 7.8DOWNGRADE

CVE-2021-44335 is a high-severity flaw (CVSS 7.8) affecting ok-file-formats. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow. When the function of the ok-file-formats project is used, a heap-buffer-overflow occurs in function ok_png_transform_scanline() in "/ok_png.c:533".

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-03-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ok-file-formats project

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

Am I affected?

Timeline

2022-03-03 00:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

ok-file-formats project ok-file-formats DOWNGRADE

Affected: 2021-06-05

Fixed in: no fixed release known

Safe to downgrade to: a release before 2021-06-05

1. Check installed version

apt-cache policy ok-file-formats || rpm -q ok-file-formats || ok-file-formats --version

2. No fixed release: DOWNGRADE to a release before 2021-06-05 (Debian / Ubuntu)

apt-cache madison ok-file-formats sudo apt install ok-file-formats=<VERSION_BEFORE_2021-06-05> sudo apt-mark hold ok-file-formats

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

dnf --showduplicates list ok-file-formats sudo dnf downgrade ok-file-formats-<VERSION_BEFORE_2021-06-05> sudo dnf versionlock add ok-file-formats

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-2021-44335?

ok-file-formats: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-44335 being exploited?

CVE-2021-44335 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-2021-44335 affect?

CVE-2021-44335 affects ok-file-formats. Severity is high (CVSS 7.8). David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow. When the function of the ok-file-formats project is used, a heap-buffer-overflow occurs in function ok_png_transform_scanline() in "/ok_png.c:533".

How urgent is CVE-2021-44335?

Priority 46/100. High severity; Public exploit reference

Related CVEs

CVE-2021-44343 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow
CVE-2021-44342 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow via function ok_png_transform_scanline
CVE-2021-44340 HIGH 7.8 MITIGATE David Brackeen ok-file-formats dev version is vulnerable to Buffer Overflow
CVE-2021-44339 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow
CVE-2021-44334 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 97f78ca is vulnerable to Buffer Overflow

References

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