VulnerabilityModified
CVE-2024-56522
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.
HIGH 7.5EPSS 0.63%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.63% probability · 48th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-843
- Affected
- tcpdf project/tcpdf
- Source
- cve@mitre.org
References
- https://github.com/tecnickcom/TCPDF/commit/d54b97cec33f4f1a5ad81119a82085cad93cec89Patch
- https://github.com/tecnickcom/TCPDF/compare/6.7.8...6.8.0Issue Tracking
- https://tcpdf.orgProduct
- https://www.php.net/manual/en/types.comparisons.phpNot Applicable
- https://lists.debian.org/debian-lts-announce/2025/06/msg00004.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.