CVE-2026-120752

High

Description

PyMuPDF 1.25.3 before 2.0 contains a stack-based buffer overflow vulnerability in JM_set_annot_callout_line() that copies a caller-supplied number of callout points into a fixed three-element stack array. Attackers who control the callout argument passed to Page.add_freetext_annot() can supply four or more points to overwrite the stack frame, crashing the process or executing code.

SeverityHigh

CVSS7.5

Exploit probability—

ProductPyMuPDF

PublishedNov 2, 2026

First seenNov 4, 2026

Weakness typeCWE-121CWE-121

How to fix

Update

PyMuPDF PyMuPDF2.0 or later

Patches

github.com/pymupdf/PyMuPDF/commit/d4298ead84ceeae1c9065c81cd9a275a1b092f5e

Vendor advisories

github.com/pymupdf/PyMuPDF/releases/tag/2.0

Affected products

Product	Affected versions	Fixed in
PyMuPDF PyMuPDF	1.25.3 ≤ v < 2.0	2.0

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