Windows
CVE-2026-23951
MEDIUM
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionGitHub Advisory
SumatraPDF is a multi-format reader for Windows. All versions contain an off-by-one error in the validation code that only triggers with exactly 2 records, causing an integer underflow in the size calculation. This bug exists in PalmDbReader::GetRecord when opening a crafted Mobi file, resulting in an out-of-bounds heap read that crashes the app. There are no published fixes at the time of publication.
AnalysisAI
SumatraPDF on Windows is vulnerable to a denial-of-service attack through a maliciously crafted Mobi file that triggers an integer underflow in record validation, causing an out-of-bounds heap read and application crash. The vulnerability stems from an off-by-one error in the PalmDbReader::GetRecord function that only occurs with exactly 2 records, and public exploit code is available. No patch has been released at this time.
Technical ContextAI
Classified as CWE-125 (Out-of-bounds Read). Affects Sumatrapdf. SumatraPDF is a multi-format reader for Windows. All versions contain an off-by-one error in the validation code that only triggers with exactly 2 records, causing an integer underflow in the size calculation. This bug exists in PalmDbReader::GetRecord when opening a crafted Mobi file, resulting in an out-of-bounds heap read that crashes the app. There are no published fixes at the time of publication.
RemediationAI
Monitor vendor advisories for a patch.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Integer Overflow
View allShare
External POC / Exploit Code
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