CVE-2026-55554 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-55554LOW

Dompdf: Chroot Validation Bypass

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   P   L   N   N    2.3   .0028   20.4     —

AFFECTED
  Product  Versions   Fixed
  dompdf   < 3.1.6 –  —

TIMELINE
  Jun 16  Reserved by GitHub_M
  Jul 28  EXPLOIT PUBLISHED — CVE-2026-55554 (dompdf). Public exploit reference added.
  Jul 28  Published (CNA: GitHub_M)
  Aug 5   EXPLOIT PUBLISHED — CVE-2026-55554 (dompdf). Public exploit reference added.

CWE-20 · CNA: GitHub_M · CVSS v4.0 · 2 references · NVD status: Analyzed

Description

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, or /var/www_backup. An attacker who controls part of the rendered HTML could exploit this to escape the chroot and read sensitive files outside the allowed directory. This issue has been fixed in version 3.16.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
June 16, 2026	Reserved	Reserved by GitHub_M
July 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55554 (dompdf). Public exploit reference added.
July 28, 2026	Published	Published (CNA: GitHub_M)
August 5, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55554 (dompdf). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
dompdf	dompdf	—	< 3.1.6	—

Weaknesses

CWE-20

References (2)

https://github.com/dompdf/dompdf/releases/tag/v3.1.6 [Release Notes]
https://github.com/dompdf/dompdf/security/advisories/GHSA-wvh6-f5jh-8gw4 [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-55554 at cve.org

Vendors: dompdf

Weaknesses: CWE-20

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55554 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.