Arbitrary file write via unsanitized font name
Published Sep 14, 2026 · Updated Sep 14, 2026
Path traversal in PyMuPDF through 1.28.2 allows attackers to write extracted font files outside the selected output directory. The font branch of extract_objects() uses a document-controlled BaseFont value as the filename and joins it to the output directory without removing decoded separators or dot-dot segments. Processing a crafted PDF, EPUB, XPS, or FB2 file is required; no authentication or elevated privilege is needed, and the resulting write can place a font file at an attacker-chosen filesystem path.
Summary
What happened
Path traversal in PyMuPDF through 1.28.2 allows attackers to write extracted font files outside the selected output directory. The font branch of extract_objects() uses a document-controlled BaseFont value as the filename and joins it to the output directory without removing decoded separators or dot-dot segments. Processing a crafted PDF, EPUB, XPS, or FB2 file is required; no authentication or elevated privilege is needed, and the resulting write can place a font file at an attacker-chosen filesystem path.
The record
- CVE
- CVE-2026-82035
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Vendor
- Artifex Software, Inc.
- Product
- PyMuPDF
- Classifications
- T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 14, 2026CVE publishedPublication date reported by the CVE source.
- Sep 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=1.8.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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