---
id: CVE-2026-120752
title: >-
  PyMuPDF 1.25.3 before 2.0 Stack Buffer Overflow via add_freetext_annot()
  Callout
summary: >-
  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
  callou…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-121
vendor: PyMuPDF
product: PyMuPDF
affected:
  - PyMuPDF >= 1.25.3 < 2.0
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-07T02:26:40.474256Z'
exploitAvailable: true
published: '2026-11-02'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T02:27:07.671Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120752'
references:
  - url: 'https://github.com/pymupdf/PyMuPDF/issues/5112'
    label: 'GitHub Issue #5112'
  - url: 'https://github.com/pymupdf/PyMuPDF/issues/5173'
    label: 'GitHub Issue #5173'
  - url: >-
      https://github.com/pymupdf/PyMuPDF/commit/d4298ead84ceeae1c9065c81cd9a275a1b092f5e
    label: Patch Commit
  - url: 'https://github.com/pymupdf/PyMuPDF/blob/1.28.2/src/extra.i#L787-L797'
  - url: 'https://github.com/pymupdf/PyMuPDF/releases/tag/2.0'
    label: PyMuPDF 2.0 Release Notes
  - url: 'https://github.com/pymupdf/PyMuPDF'
  - url: >-
      https://www.vulncheck.com/advisories/pymupdf-1.25.3-before-2.0-stack-buffer-overflow-via-add-freetext-annot-callout
    label: >-
      VulnCheck Advisory: PyMuPDF 1.25.3 before 2.0 Stack Buffer Overflow via
      add_freetext_annot() Callout
tags:
  - cve.org
  - exploit-available
epss: 0.00373
epssPercentile: 0.31515
ingestedAt: '2026-11-05T19:30:42.873Z'
---

## Overview

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.

## Affected

- `PyMuPDF >= 1.25.3 < 2.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.