CVE-2026-107729

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 INTMAX become negative and bypass the upper-bound check. When the EXTH flag is set, the original unsigned value is...

CVE-2026-107729

The multi-format reader SumatraPDF (version 3.7.0.22298) is vulnerable to an out-of-bounds read in src/MobiDoc.cpp during MOBI parsing. The root cause is an unsigned-to-signed conversion where the mobiHdr.hdrLen field is narrowed to a signed integer for validation. Values exceeding INT_MAX become...

CVE-2026-107729 SumatraPDF: Unsigned-to-signed hdrLen validation bypass in SumatraPDF MOBI parsing causes out-of-bounds read

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 INTMAX become negative and bypass the upper-bound check. When the EXTH flag is set, the original unsigned value is...

CVE-2026-107729 SumatraPDF: Unsigned-to-signed hdrLen validation bypass in SumatraPDF MOBI parsing causes out-of-bounds read

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 INTMAX become negative and bypass the upper-bound check. When the EXTH flag is set, the original unsigned value is...

CVE-2026-26054

SumatraPDF, a multi-format reader for Windows, is vulnerable to a heap out-of-bounds read in the MobiDoc::ParseHeader function within src/MobiDoc.cpp. The issue occurs because DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without verifying the actual remaining buffer length, e...

EUVD-2026-86296

SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MO...

CVE-2026-26054 SumatraPDF: Heap out-of-bounds read in MOBI header parser.

SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MO...

CVE-2026-26054 SumatraPDF: Heap out-of-bounds read in MOBI header parser.

SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MO...

CVE-2026-26054: Out-of-bounds Read

SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MO...

CVE-2026-27777

Technical details (affected products, versions, root cause, exploitability, mitigations) are not publicly available in the provided documents. Monitor for updates from official advisories.

CVE-2026-25920

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...

CVE-2026-25920

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...

CVE-2026-25920

CVE-2026-25920 affects SumatraPDF

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

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...

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

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...

CVE-2026-25920

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...

CVE-2026-25920: Out-of-bounds Read

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...

sumatrapdf 缓冲区错误漏洞

sumatrapdf is an open-source PDF reader developed by sumatrapdfreader. Versions of sumatrapdf 3.5.2 and earlier have a buffer error vulnerability. This vulnerability stems from heap out-of-bound reading in the MOBI HuffDic decompressor, which may lead to crashes...

PT-2026-7171

Name of the Vulnerable Software and Affected Versions SumatraPDF versions 3.5.2 and earlier Description A heap out-of-bounds read issue exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check within the AddCdicData function does not validate the complete range accessed by the DecodeOne...

CVE-2026-23951

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 ...