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…
Published: 2026-02-09 · CVSS: 5.5 · CVSS 3.1
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 nearly (1 << codeLength) bytes beyond the CDIC dictionary buffer, leading to a crash.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7