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CVE-2026-107730— SumatraPDF: Signed integer overflow in the LIT header parsing causes invalid-pointer read

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 是一款适用于 Windows 的多格式 PDF 阅读器。在版本 3.7.0.22298 中，src/LitDoc.cpp 文件中的 LitParseHeader() 函数使用有符号 32 位算术计算由攻击者控制的 hdrLen + nPieces * 16 部分偏移量，而未对最终计算结果进行完整性验证。当各组件值导致该聚合计算溢出为负数时，指针构造过程会在 LitU32() 中引发无效读取，从而导致应用程序确定性地终止。现有证据并未证明该漏洞可导致代码执行、信息泄露、任意内存读取或完整性破坏。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-107730

Vulnerability Information
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Vulnerability Title
SumatraPDF: Signed integer overflow in the LIT header parsing causes invalid-pointer read
Source: CVE Program / CVE List V5
Vulnerability Description
SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, LitParseHeader() in src/LitDoc.cpp computes the attacker-controlled hdrLen + nPieces * 16 section offset using signed 32-bit arithmetic without validating the complete result. When the component values make that aggregate calculation overflow to a negative value, pointer construction reaches an invalid read in LitU32(), causing deterministic application termination. The supplied evidence does not demonstrate code execution, information disclosure, arbitrary read, or integrity impact. No fixed version is available as of this review.
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
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sumatrapdfreader sumatrapdf <= 3.7.0.22298 -

II. Public POCs for CVE-2026-107730

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III. Intelligence Information for CVE-2026-107730

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Patches & Fixes for CVE-2026-107730 (1)

Vendor Advisories for CVE-2026-107730 (1)

Same Patch Batch · sumatrapdfreader · 2026-10-08 · 11 CVEs total

CVE-2026-107732 8.4 HIGH SumatraPDF: Markup/command-link injection into UI notification text
CVE-2026-107734 7.1 HIGH SumatraPDF: SyncTeX Argument Injection in Inverse Search Enables Arbitrary Command Executi
CVE-2026-107802 7.1 HIGH SumatraPDF — Windows command-line argument injection in AI selection-translate
CVE-2026-107733 6.8 MEDIUM SumatraPDF: Null-pointer dereference in `CmdExec` when no document tab is open
CVE-2026-107736 6.8 MEDIUM SumatraPDF: stack buffer overflow while processing EXIF Orientation metadata
CVE-2026-107738 6.8 MEDIUM SumatraPDF: Untrusted binary record offset used without lower-bound validation
CVE-2026-107737 5.7 MEDIUM SumatraPDF CHM `its://` signed index causes an out-of-bounds object lookup
CVE-2026-107731 5.5 MEDIUM SumatraPDF: LIT parser range-validation flaws cause invalid-pointer reads and denial of se
CVE-2026-107729 5.5 MEDIUM SumatraPDF: Unsigned-to-signed hdrLen validation bypass in SumatraPDF MOBI parsing causes
CVE-2026-107735 5.4 MEDIUM SumatraPDF: `sumatrapdfrestrict.ini` never revokes any permission (fail-open policy initia

IV. Related Vulnerabilities

Same product: sumatrapdf
Same vendor: sumatrapdfreader
Same weakness: CWE-190

V. Comments for CVE-2026-107730

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