CVE-2006-5793: The sPLT chunk handling code (png_set_sPLT function in pngset.c) in libpng 1.0.6 through 1.2.12 uses a sizeof

Routine

LOW 2.6DOWNGRADE

CVE-2006-5793 is a low-severity flaw (CVSS 2.6) affecting libpng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The sPLT chunk handling code (png_set_sPLT function in pngset.c) in libpng 1.0.6 through 1.2.12 uses a sizeof operator on the wrong data type, which allows context-dependent attackers to cause a denial of service (crash) via malformed sPLT chunks that trigger an out-of-bounds read.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	2.6 (Low)
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-20
Published	2006-11-17
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: greg roelofs

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-11-17 23:07 UTCPublished CVE record published
2026-06-16 22:31 UTCUpdated Record last modified

greg roelofs libpng DOWNGRADE

Affected: 1.0.6 · 1.0.7 · 1.0.8 · 1.0.9 · 1.2.0 · 1.2.1 · 1.2.2 · 1.2.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.6 (Debian / Ubuntu)

apt-cache madison libpng sudo apt install libpng=<VERSION_BEFORE_1.0.6> sudo apt-mark hold libpng

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

dnf --showduplicates list libpng sudo dnf downgrade libpng-<VERSION_BEFORE_1.0.6> sudo dnf versionlock add libpng

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-2006-5793?

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

Is CVE-2006-5793 being exploited?

CVE-2006-5793 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-2006-5793 affect?

CVE-2006-5793 affects libpng. Severity is low (CVSS 2.6). The sPLT chunk handling code (png_set_sPLT function in pngset.c) in libpng 1.0.6 through 1.2.12 uses a sizeof operator on the wrong data type, which allows context-dependent attackers to cause a denial of service (crash) via malformed sPLT

How urgent is CVE-2006-5793?

Priority 29/100. No elevated risk signals yet.

Software pages

libpng vulnerabilities

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References

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