CVE-2026-107729 — SumatraPDF is a multi-format reader for Windows.
Description
SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, src/MobiDoc.cpp narrows the untrusted unsigned mobiHdr.hdrLen field to a signed integer for validation; values above INT_MAX become negative and bypass the upper-bound check. When the EXTH flag is set, the original unsigned value is reused as a pointer offset, causing DecodeExthHeader() to read beyond the record buffer. Opening a crafted MOBI file can reliably terminate the application with a native access violation; no code execution, information disclosure, or integrity impact has been demonstrated. No fixed version is available as of this review.
CVSS v3.1 base metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HMedium severity
Band computed from the CVSS base score, not the source's own label — so it means the same thing across every feed.
AV
Local
Attack Vector
AC
Low
Attack Complexity
PR
None
Privileges Required
UI
Required
User Interaction
S
Unchanged
Scope
C
None
Confidentiality
I
None
Integrity
A
High
Availability
References
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