Bug 2565416 (CVE-2026-120752)

Summary: CVE-2026-120752 PyMuPDF: PyMuPDF: Arbitrary code execution via stack-based buffer overflow in JM_set_annot_callout_line
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in PyMuPDF. An attacker who controls input passed to the free text annotation feature can exploit this vulnerability to execute arbitrary code or cause a denial of service (DoS) by crashing the application. This issue is caused by copying caller-supplied callout points into a fixed-size memory buffer without adequate bounds validation, resulting in a stack-based buffer overflow.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2567074, 2567075, 2567076    
Bug Blocks:    

Description OSIDB Bzimport 2026-11-02 22:21:21 UTC 
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.