CVE-2024-56522

Summary

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 Software

Weaknesses

• n/a

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html

References

• https://tcpdf.org
• https://github.com/tecnickcom/TCPDF/compare/6.7.8…6.8.0
• https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89
• https://www.php.net/manual/en/types.comparisons.php

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