CVE-2026-107731

SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, four independently reachable range-validation variants in src/LitDoc.cpp allow file-controlled offsets and sizes to overflow, narrow to negative values, or wrap before incomplete bounds checks. The affected calculations include contentOffset, the directory expression dirOff64 + dirLen64, and the decoded-section offset + size, along with secondary-header range handling. Opening a crafted LIT file that reaches one of these variants can cause invalid pointer reads and deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.

• CWE-125

• https://github.com/sumatrapdfreader/sumatrapdf/commit/5d43b8cf9c45335ffd47e616bfa27648f17d0b63
• https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-753j-hx3p-xm9g

Published

Oct 8, 2026

Last Modified

Oct 9, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-107726Hazelcast is a unified real-time data platform combining str…9.3
• CVE-2026-107727Strawberry GraphQL is a library for creating GraphQL APIs. F…3.7
• CVE-2026-107728Strawberry GraphQL is a library for creating GraphQL APIs. F…7.5
• CVE-2026-107729SumatraPDF is a multi-format reader for Windows. In 3.7.0.22…5.5
• CVE-2026-10773The DHCPv4 client helper net_dhcpv4_msg_type_name() in subsy…5.4
• CVE-2026-107730SumatraPDF is a multi-format reader for Windows. In 3.7.0.22…5.5
• CVE-2026-107732SumatraPDF is a multi-format reader for Windows. In 3.6.1 an…8.4
• CVE-2026-107733SumatraPDF is a multi-format reader for Windows. In 3.6.1 an…6.8
• CVE-2026-107734SumatraPDF is a multi-format reader for Windows. In 3.5.2 an…7.1
• CVE-2026-107735SumatraPDF is a multi-format reader for Windows. In 3.6.1 an…5.4
• CVE-2026-107736SumatraPDF is a multi-format reader for Windows. In 3.6.1 an…6.8
• CVE-2026-107737SumatraPDF is a multi-format reader for Windows. In 3.6.1 an…5.7