CVE-2026-120752
PyMuPDF 1.25.3 before 2.0 Stack Buffer Overflow via add_freetext_annot() Callout
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-121 |
| Vendor | pymupdf |
| Product | pymupdf |
| Published | Nov 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
PyMuPDF / PyMuPDF
1.25.3 < 2.0
References
github.com: https://github.com/pymupdf/PyMuPDF/issues/5112 github.com: https://github.com/pymupdf/PyMuPDF/issues/5173 github.com: https://github.com/pymupdf/PyMuPDF/commit/d4298ead84ceeae1c9065c81cd9a275a1b092f5e github.com: https://github.com/pymupdf/PyMuPDF/blob/1.28.2/src/extra.i#L787-L797 github.com: https://github.com/pymupdf/PyMuPDF/releases/tag/2.0 github.com: https://github.com/pymupdf/PyMuPDF vulncheck.com: https://www.vulncheck.com/advisories/pymupdf-1.25.3-before-2.0-stack-buffer-overflow-via-add-freetext-annot-callout
Credits
k3rn3lbr3ach3r Dilanka Kaushal Hewage (r3vpwnx)