GitHub Advisoryadvisory · Packagist

GHSA-w95c-7994-ghpr TCPDF has incorrect comparison

HIGH Published 2024-12-27 Modified 2025-11-03 Official page ↗

Aliases: CVE-2024-56522
Ecosystem: Packagist
Packages: tecnickcom/tcpdf
Severity: High
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses: CWE-697, CWE-843
Reviewed: 2024-12-27

Affected packages

• Packagist tecnickcom/tcpdf: < 6.8.0 → fixed in 6.8.0

Description

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.

Alias · CVE (1)

CVE-2024-56522 An issue was discovered in TCPDF before 6.8.0. vulnerability

Weakness · CWE (2)

CWE-697 Incorrect Comparison weakness
CWE-843 Access of Resource Using Incompatible Type weakness

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