CVE-2026-18309: GIMP APNG File Parsing Integer Overflow Remote Code Execution Vulnerability

Routine

HIGH 7.8DOWNGRADE

CVE-2026-18309 is a high-severity flaw (CVSS 7.8) affecting gimp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GIMP APNG File Parsing Integer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GIMP. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of APNG files. The issue results from the lack of proper validation of user-supplied data, w

Why this priority

High severity

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 60%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-08-20
Last modified	2026-10-26

Publisher (CNA): Zero Day Initiative · Vendor: gimp

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-20 17:17 UTCPublished CVE record published
2026-10-26 10:10 UTCUpdated Record last modified

gimp gimp DOWNGRADE

Affected: 3.2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.2.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.2.2 (Debian / Ubuntu)

apt-cache madison gimp sudo apt install gimp=<VERSION_BEFORE_3.2.2> sudo apt-mark hold gimp

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

dnf --showduplicates list gimp sudo dnf downgrade gimp-<VERSION_BEFORE_3.2.2> sudo dnf versionlock add gimp

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-2026-18309?

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

Is CVE-2026-18309 being exploited?

CVE-2026-18309 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-2026-18309 affect?

CVE-2026-18309 affects gimp. Severity is high (CVSS 7.8). GIMP APNG File Parsing Integer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of GIMP. User interaction is required to exploit this vulnerability

How urgent is CVE-2026-18309?

Priority 37/100. High severity

Related CVEs

CVE-2026-18307 HIGH 7.8 DOWNGRADE GIMP TIF File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability
CVE-2026-18302 HIGH 7.8 DOWNGRADE GIMP TIF File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability
CVE-2026-18303 HIGH 7.8 DOWNGRADE GIMP TIF File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability
CVE-2026-18304 HIGH 7.8 DOWNGRADE GIMP TIF File Parsing Integer Overflow Remote Code Execution Vulnerability
CVE-2026-18305 HIGH 7.8 DOWNGRADE GIMP TIF File Parsing Integer Overflow Remote Code Execution Vulnerability

References

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