What’s Vulnerable › Vulnerabilities

CVE-2024-56522

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-27 · updated 2026-06-17
• Weakness: CWE-843

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.

Affected products

• tecnick tcpdf: before 6.8.0 — fixed in 6.8.0

How to fix

Upgrade to a fixed version: tecnick tcpdf 6.8.0. Check the vendor advisory for mitigations.

References

• https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
• https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0
• https://tcpdf.org
• https://www.php.net/manual/en/types.comparisons.php
• https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html

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