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.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV N L P N P L N N 2.3 .0051 41.3 —
AFFECTED Product Versions Fixed dompdf < 3.1.6 – —
TIMELINE Jun 16 Reserved by GitHub_M Jul 28 EXPLOIT PUBLISHED — CVE-2026-55555 (dompdf). Public exploit reference added. Jul 28 Published (CNA: GitHub_M)
Dompdf is an HTML to PDF converter for PHP. Versions 3.15 and prior are vulnerable to a File Existence Oracle attack through the manipulation of the CSS @font-face directive. By providing malicious HTML that references local files via the file:// protocol repeatedly, an attacker can trigger PHP memory exhaustion. Because Dompdf behaves differently depending on whether a referenced local file exists (an existing file is processed repeatedly until it triggers an "Allowed memory size exhausted" crash, whereas a missing file fails fast or is ignored and never hits the memory limit), an attacker can use this observable discrepancy as an oracle to enumerate sensitive files on the server regardless of CHROOT restrictions. Exploitation requires the attacker to supply unrestricted or unsanitized HTML in a request that permits large data, plus a configuration where Dompdf's memory limit is low enough to be exhausted (with $_dompdf_show_warnings=true making the overflow easier to reach). This issue has been fixed in version 3.16.
| Date | Event | Detail |
|---|---|---|
| June 16, 2026 | Reserved | Reserved by GitHub_M |
| July 28, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-55555 (dompdf). Public exploit reference added. |
| July 28, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| dompdf | dompdf | — | < 3.1.6 | — |
Authoritative record: CVE-2026-55555 at cve.org
Vendors: dompdf
Weaknesses: CWE-203
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55555 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.