GHSA-w95c-7994-ghpr

TCPDF has incorrect comparison

Source: GitHub Advisory Database (reviewed) High CVE-2024-56522

Packages

Ecosystem	Package	Affected	Fixed in
Packagist	tecnickcom/tcpdf	< 6.8.0	6.8.0

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.

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