CVE-2018-25306: PDFunite 0.41.0 contains a buffer overflow vulnerability that allows local attackers to crash the application

Routine

MEDIUM 6.2DOWNGRADE

CVE-2018-25306 is a medium-severity flaw (CVSS 6.2) affecting pdfunite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PDFunite 0.41.0 contains a buffer overflow vulnerability that allows local attackers to crash the application by processing malformed PDF files during merge operations. Attackers can trigger a segmentation fault in the XRef::getEntry function within libpoppler by providing a specially crafted PDF file to the pdfunite utility.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.2 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-120
Published	2026-04-29
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: canonical

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

Am I affected?

Timeline

2026-04-29 20:16 UTCPublished CVE record published
2026-06-17 01:55 UTCUpdated Record last modified

canonical pdfunite DOWNGRADE

Affected: 0.41.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.41.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.41.0 (Debian / Ubuntu)

apt-cache madison pdfunite sudo apt install pdfunite=<VERSION_BEFORE_0.41.0> sudo apt-mark hold pdfunite

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

dnf --showduplicates list pdfunite sudo dnf downgrade pdfunite-<VERSION_BEFORE_0.41.0> sudo dnf versionlock add pdfunite

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-2018-25306?

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

Is CVE-2018-25306 being exploited?

CVE-2018-25306 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-2018-25306 affect?

CVE-2018-25306 affects pdfunite. Severity is medium (CVSS 6.2). PDFunite 0.41.0 contains a buffer overflow vulnerability that allows local attackers to crash the application by processing malformed PDF files during merge operations. Attackers can trigger a segmentation fault in the XRef::getEntry functi

How urgent is CVE-2018-25306?

Priority 29/100. Public exploit reference

References

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