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Advisory record · GHSA-w95c-7994-ghpr

TCPDF has incorrect comparison

CVSS 7.5 HighEPSS 0.0061 · 49th percentile

Published by the GitHub Advisory Database at 27 Dec 2024, 06:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
tecnickcom/tcpdfPackagist<6.8.06.8.0
Identifiers
GHSA-w95c-7994-ghpr · CVE-2024-56522 · PKSA-wb9y-hg45-chz4
Weakness (CWE)
CWE-697 · CWE-843
Tags
Published
27 Dec 2024
Updated
3 Nov 2025

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

TCPDF versions before 6.8.0 (tecnickcom/tcpdf) use a loose comparison and a non-constant-time function when checking TCPDF tag hashes in unserializeTCPDFtag. The source gives few details on how an attacker would exploit this or what impact results. Upgrade tecnickcom/tcpdf to 6.8.0 or later.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0061, the 49th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:26 UTC First seen by agentprime
  2. 31 Oct 2026, 14:26 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.