HIGH7.5

GHSA-w95c-7994-ghpr

TCPDF has incorrect comparison

Quick fix

GHSA-w95c-7994-ghpr — tecnickcom/tcpdf: upgrade to the fixed version with the command below.

composer require tecnickcom/tcpdf:^6.8.0

Details

An issue was discovered in TCPDF before 6.8.0. unserializeTCPDFtag uses != (aka loose comparison) and does not use a constant-time function to compare TCPDF tag hashes.

Are you affected?

Enter the version of the package you're using.

Affected packages

Packagist/tecnickcom/tcpdf

Introduced in: 0Fixed in: 6.8.0

Fixcomposer require tecnickcom/tcpdf:^6.8.0

References

https://nvd.nist.gov/vuln/detail/CVE-2024-56522[ADVISORY]
https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89[WEB]
https://github.com/tecnickcom/TCPDF[PACKAGE]
https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0[WEB]
https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html[WEB]
https://tcpdf.org[WEB]
https://www.php.net/manual/en/types.comparisons.php[WEB]