CVE Catalog

CVE-2026-77220

MediumCVSS 6.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.24%

15th percentile - higher than 15% of all known CVEs

Summary

PDFio before 1.6.5 contains a dangling pointer vulnerability in the dictionary string-formatting function that stores a pointer to a stack-local buffer in the document dictionary without copying the string value. In multi-threaded or pooled-request environments, attackers or concurrent users can trigger stack memory reuse across requests, causing cross-tenant document content corruption by silently overwriting one caller's dictionary string values with another caller's data.

Risk Assessment

The vulnerability can lead to cross-tenant data integrity issues, potentially resulting in unauthorized disclosure or modification of document content.

Recommendation

It is recommended to immediately upgrade the PDFio library to version 1.6.5 or later, which includes a fix for the dangling pointer.

Related vulnerabilities

Original NVD description (English source)

PDFio before 1.6.5 contains a dangling pointer vulnerability in the dictionary string-formatting function that stores a pointer to a stack-local buffer in the document dictionary without copying the string value. In multi-threaded or pooled-request environments, attackers or concurrent users can trigger stack memory reuse across requests, causing cross-tenant document content corruption by silently overwriting one caller's dictionary string values with another caller's data.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS