CVE-2023-43907: OptiPNG v0.7.7 was discovered to contain a global buffer overflow via the 'buffer' variable at gifread.c.

This month

HIGH 7.8DOWNGRADE

CVE-2023-43907 is a high-severity flaw (CVSS 7.8) affecting optipng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OptiPNG v0.7.7 was discovered to contain a global buffer overflow via the 'buffer' variable at gifread.c.

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	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-10-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: optipng project

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

Am I affected?

Timeline

2023-10-01 01:15 UTCPublished CVE record published
2026-06-17 06:26 UTCUpdated Record last modified

optipng project optipng DOWNGRADE

Affected: 0.7.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.7.7 (Debian / Ubuntu)

apt-cache madison optipng sudo apt install optipng=<VERSION_BEFORE_0.7.7> sudo apt-mark hold optipng

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

dnf --showduplicates list optipng sudo dnf downgrade optipng-<VERSION_BEFORE_0.7.7> sudo dnf versionlock add optipng

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-2023-43907?

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

Is CVE-2023-43907 being exploited?

CVE-2023-43907 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-2023-43907 affect?

CVE-2023-43907 affects optipng. Severity is high (CVSS 7.8). OptiPNG v0.7.7 was discovered to contain a global buffer overflow via the 'buffer' variable at gifread.c.

How urgent is CVE-2023-43907?

Priority 42/100. High severity; Public exploit reference

Related CVEs

CVE-2017-16938 HIGH 7.8 DOWNGRADE A global buffer overflow in OptiPNG 0.7.6 allows remote attackers to cause a denial-of-service attack or other
CVE-2017-1000229 HIGH 7.8 DOWNGRADE MITIGATE Integer overflow bug in function minitiff_read_info() of optipng 0.7.6 allows an attacker to remotely execute
CVE-2016-3982 HIGH 8.8 MITIGATE MITIGATE Off-by-one error in the bmp_rle4_fread function in pngxrbmp.c in OptiPNG before 0.7.6 allows remote attackers
CVE-2016-3981 HIGH 7.8 UPGRADE MITIGATE Heap-based buffer overflow in the bmp_read_rows function in pngxrbmp.c in OptiPNG before 0.7.6 allows remote a
CVE-2016-2191 MEDIUM 6.5 DOWNGRADE MITIGATE The bmp_read_rows function in pngxtern/pngxrbmp.c in OptiPNG before 0.7.6 allows remote attackers to cause a d

References

← Back to latest CVEs