CVE-2026-55554: Dompdf is an HTML to PDF converter for PHP

Q: How do I fix CVE-2026-55554?

dompdf: upgrade to 3.1.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-55554 being exploited?

CVE-2026-55554 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-55554 affect?

CVE-2026-55554 affects dompdf. Severity is high (CVSS 7.5). Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, the validateLocalUri() method enforces chroot boundaries with a strpos() prefix check after normalizing paths with realpath() . Because normalization strips the traili

Q: How urgent is CVE-2026-55554?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-55554 is a high-severity flaw (CVSS 7.5) affecting dompdf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, the validateLocalUri() method enforces chroot boundaries with a strpos() prefix check after normalizing paths with realpath() . Because normalization strips the trailing directory separator from $chrootPath , the check only verifies that $chrootPath is a string prefix of $realfile, so a chroot of /var/www also matches sibling directories like /var/www2 , /var/www-admin,

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-20
Published	2026-07-28
Last modified	2026-08-05

Publisher (CNA): GitHub, Inc. · Vendor: dompdf project

Last updated 2026-08-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-28 20:17 UTCPublished CVE record published
2026-08-05 16:37 UTCUpdated Record last modified

dompdf project dompdf UPGRADE

Affected: < 3.1.6

Fixed in: 3.1.6

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.1.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dompdf

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dompdf

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-55554?

dompdf: upgrade to 3.1.6. Exact commands for each OS are on this page.

Is CVE-2026-55554 being exploited?

CVE-2026-55554 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-2026-55554 affect?

CVE-2026-55554 affects dompdf. Severity is high (CVSS 7.5). Dompdf is an HTML to PDF converter for PHP. In versions 3.15 and prior, the validateLocalUri() method enforces chroot boundaries with a strpos() prefix check after normalizing paths with realpath() . Because normalization strips the traili

How urgent is CVE-2026-55554?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-55555 HIGH 7.5 UPGRADE Dompdf is an HTML to PDF converter for PHP
CVE-2026-56722 MEDIUM 5.3 UPGRADE Dompdf is an HTML to PDF converter for PHP
CVE-2026-59941 HIGH 7.5 UPGRADE Dompdf is an HTML to PDF converter for PHP
CVE-2026-59942 HIGH 7.5 UPGRADE Dompdf is an HTML to PDF converter for PHP
CVE-2026-59943 MEDIUM 5.3 UPGRADE Dompdf is an HTML to PDF converter for PHP

References

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