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

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/pymupdf/PyMuPDF/commit/d4298ead84ceeae1c9065c81cd9a275a1b092f5e

## Affected products and versions

- PyMuPDF / PyMuPDF (pymupdf): ≥ 1.25.3; < 2.0 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.7 (high); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 7.7 (high); CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-121

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/pymupdf/PyMuPDF/issues/5112 (CNA: VulnCheck; issue-tracking)

- https://github.com/pymupdf/PyMuPDF/issues/5173 (CNA: VulnCheck; issue-tracking, technical-description)

- https://github.com/pymupdf/PyMuPDF/commit/d4298ead84ceeae1c9065c81cd9a275a1b092f5e (CNA: VulnCheck; patch)

- https://github.com/pymupdf/PyMuPDF/blob/1.28.2/src/extra.i#L787-L797 (CNA: VulnCheck; technical-description)

- https://github.com/pymupdf/PyMuPDF/releases/tag/2.0 (CNA: VulnCheck; release-notes)

- https://github.com/pymupdf/PyMuPDF (CNA: VulnCheck; product)

- https://www.vulncheck.com/advisories/pymupdf-1.25.3-before-2.0-stack-buffer-overflow-via-add-freetext-annot-callout (CNA: VulnCheck; third-party-advisory)

- https://github.com/pymupdf/PyMuPDF (disclosure@vulncheck.com)

- https://github.com/pymupdf/PyMuPDF/blob/1.28.2/src/extra.i#L787-L797 (disclosure@vulncheck.com)

- https://github.com/pymupdf/PyMuPDF/commit/d4298ead84ceeae1c9065c81cd9a275a1b092f5e (disclosure@vulncheck.com)

- https://github.com/pymupdf/PyMuPDF/issues/5112 (disclosure@vulncheck.com)

- https://github.com/pymupdf/PyMuPDF/issues/5173 (disclosure@vulncheck.com)

- https://github.com/pymupdf/PyMuPDF/releases/tag/2.0 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/pymupdf-1.25.3-before-2.0-stack-buffer-overflow-via-add-freetext-annot-callout (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-120752; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-120752; retrieved 2026-11-03; source updated 2026-11-02

Revision: 7ef6dc2a470a2391e17e25fff93576aeaff587c7588e874c8664c464e8461893

Canonical: https://y2.dev/cve/CVE-2026-120752

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