CVE-2026-77220
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% 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.
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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

