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CVE-2026-25920— SumatraPDF has a heap out-of-bounds read in MOBI HuffDic decompressor

Quick assessment

Affected
sumatrapdfreader sumatrapdf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sumatrapdf是sumatrapdfreader开源的一个PDF阅读器。 SumatraPDF 3.5.2及之前版本存在缓冲区错误漏洞，该漏洞源于MOBI HuffDic解压缩器存在堆越界读取，可能导致崩溃。

CVSS 5.5 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-25920

Vulnerability Information
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Vulnerability Title
SumatraPDF has a heap out-of-bounds read in MOBI HuffDic decompressor
Source: CVE Program / CVE List V5
Vulnerability Description
SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, a heap out-of-bounds read vulnerability exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check in AddCdicData() only validates half the range that DecodeOne() actually accesses. Opening a crafted .mobi file can read nearly (1 << codeLength) bytes beyond the CDIC dictionary buffer, leading to a crash.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
sumatrapdf 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sumatrapdf是sumatrapdfreader开源的一个PDF阅读器。 SumatraPDF 3.5.2及之前版本存在缓冲区错误漏洞，该漏洞源于MOBI HuffDic解压缩器存在堆越界读取，可能导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sumatrapdfreader sumatrapdf <= 3.5.2 -

II. Public POCs for CVE-2026-25920

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III. Intelligence Information for CVE-2026-25920

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Patches & Fixes for CVE-2026-25920 (1)

Vendor Advisories for CVE-2026-25920 (1)

Same Patch Batch · sumatrapdfreader · 2026-02-09 · 3 CVEs total

CVE-2026-25880 7.8 HIGH Untrusted Search Path in SumatraPDF Reader (explorer.exe on Windows)
CVE-2026-25961 7.5 HIGH SumatraPDF Update MITM -> Arbitrary Code Execution

IV. Related Vulnerabilities

Same product: sumatrapdf
Same vendor: sumatrapdfreader
Same weakness: CWE-125

V. Comments for CVE-2026-25920

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