CVE-2026-77220:
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.
Among the 6 debian patches
available in version 1.6.5+dfsg-1 of the package,
we noticed the following issues:
6 patches
where the metadata indicates that the patch has not yet been forwarded
upstream. You should either forward the patch upstream or update the
metadata to document its real status.
Standards version of the package is outdated.
wishlist
The package should be updated to follow the last version of Debian Policy
(Standards-Version 4.7.4 instead of
4.7.0).
Migration status for pdfio (1.6.3+dfsg-2 to 1.6.5+dfsg-1): Waiting for test results or another package, or too young (no action required now - check later)
![[bug history graph]](https://qa.debian.org/data/bts/graphs/p/pdfio.png){kind=link}