PT-2026-7171 · Sumatrapdf · Sumatrapdf

Haaeein · Published 2026-02-09 · Updated 2026-02-10 · CVE-2026-25920

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions SumatraPDF versions 3.5.2 and earlier

Description A heap out-of-bounds read issue exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check within the AddCdicData() function does not validate the complete range accessed by the DecodeOne() function. Processing a specially crafted MOBI file can result in reading approximately (1 << codeLength) bytes beyond the CDIC dictionary buffer, potentially causing a crash.

Recommendations Update SumatraPDF to a version later than 3.5.2.

Exploit

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-25920

GHSA-5MWX-65X7-CFFP

Affected Products

Sumatrapdf

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25920.json · Exploit
• https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-5mwx-65x7-cffp · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25920 · Security Note
• https://osv.dev/vulnerability/CVE-2026-25920 · Vendor Advisory
• https://github.com/sumatrapdfreader/sumatrapdf/blob/916392f94bc34e24f3c3286893ac6d7fa1e1c428/src/MobiDoc.cpp · Note
• https://github.com/sumatrapdfreader/sumatrapdf/commit/12b6887e9dfff874fe8749bab1bdc53d4ff075b3 · Note
• https://twitter.com/VulmonFeeds/status/2021114447419289743 · Twitter Post
• https://t.me/CVEtracker/44237 · Telegram Post