CVE-2026-107705

Description

Poppler 0.42.0 through 26.10.0 contains a stack-based buffer overflow in Decrypt::revision6Hash() that allows attackers controlling the password to overwrite stack memory when opening AESV3/R6 encrypted PDFs. Attackers can supply a password longer than 127 bytes through applications using the libpoppler, libpoppler-glib or C++ API to overflow the K1 and E buffers, crashing the process or corrupting memory.

References

• https://gitlab.freedesktop.org/poppler/poppler
• https://gitlab.freedesktop.org/poppler/poppler/-/blob/poppler-26.10.0/poppler/Decrypt.cc#L1767
• https://gitlab.freedesktop.org/poppler/poppler/-/merge_requests/2398
• https://gitlab.freedesktop.org/poppler/poppler/-/work_items/1814
• https://www.vulncheck.com/advisories/poppler-0.42.0-through-26.10.0-stack-buffer-overflow-via-decrypt-revision6hash