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Vulnerability · Published Nov 2, 2026 · Assigned by VulnCheck

CVE-2026-120752PyMuPDF 1.25.3 before 2.0 Stack Buffer Overflow via add_freetext_annot() Callout

High 7.5

In plain English

A high-severity stack buffer overflow in PyMuPDF from PyMuPDF. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 68.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12pymupdfno fix listedDEBIAN-CVE-2026-120752
Debian:13pymupdfno fix listedDEBIAN-CVE-2026-120752
Debian:14pymupdfno fix listedDEBIAN-CVE-2026-120752
Ubuntu:22.04:LTSpymupdfno fix listedUBUNTU-CVE-2026-120752
Ubuntu:24.04:LTSpymupdfno fix listedUBUNTU-CVE-2026-120752
Ubuntu:26.04:LTSpymupdfno fix listedUBUNTU-CVE-2026-120752
Ubuntu:26.10pymupdfno fix listedUBUNTU-CVE-2026-120752

Affected products (as reported)

VendorProductVersions
PyMuPDF PyMuPDF 1.25.3 – before 2.0

Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References