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PatchSiren cyber security CVE debrief

CVE-2026-55554 dompdf CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-28T20:17:26.723Z and has not been modified since then. The NVD entry is currently Analyzed. Dompdf versions 3.15 and prior contain a path traversal issue in the validateLocalUri() method, allowing potential reading of sensitive files outside the intended directory. The issue has been fixed in version 3.16. Developers and administrators should verify their inventory and consider upgrading to the latest version. Limited details on exploitability and affected scope are available. Defenders should review system logs for unusual file access patterns and consider implementing compensating controls for exposed systems. Further verification of system configurations and potential mitigations is recommended. The CVE record indicates a path traversal issue in Dompdf versions 3.15 and prior. Evidence from official CVE and NVD sources suggests that an attacker could potentially read sensitive files outside the intended directory. Defenders should verify Dompdf inventory, review system logs for unusual file access patterns, and consider upgrading to version 3.16.

Vendor
dompdf
Product
Unknown
CVSS
LOW 2.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-28
Original CVE updated
2026-08-05
Advisory published
2026-07-28
Advisory updated
2026-08-05

Who should care

Developers and administrators using Dompdf versions 3.15 and prior should verify their inventory and consider upgrading to version 3.16. This issue may impact operators responsible for maintaining and securing PHP applications that utilize Dompdf. Vulnerability management and security teams should review the affected scope and severity to determine the necessary actions. Platform administrators and security teams should also be aware of the potential risks and take appropriate measures to mitigate them.

Technical summary

The validateLocalUri() method in Dompdf versions 3.15 and prior does not properly enforce chroot boundaries due to a flawed prefix check after path normalization. This allows an attacker to potentially read sensitive files outside the intended directory by exploiting the chroot and path traversal vulnerabilities. The issue has been fixed in version 3.16. Developers and administrators should verify their inventory and consider upgrading to the latest version.

Defensive priority

Low-priority defensive review recommended due to limited attack surface; verify Dompdf inventory and upgrade to version 3.16 if possible.

Recommended defensive actions

  • Verify Dompdf inventory and version
  • Upgrade to version 3.16 if possible
  • Monitor for unusual file access patterns
  • Review system logs for potential exploitation attempts
  • Perform a thorough review of system configurations and potential mitigations
  • Consider implementing compensating controls for exposed systems
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record indicates a path traversal issue in Dompdf versions 3.15 and prior. Evidence from official CVE and NVD sources suggests that an attacker could potentially read sensitive files outside the intended directory. Limited details on exploitability and affected scope are available. Defenders should verify Dompdf inventory, review system logs for unusual file access patterns, and consider upgrading to version 3.16. Further verification of system configurations and potential mitigations is recommended.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-28T20:17:26.723Z and has not been modified since then.