Vulnerability Description
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 MOBI file can use an attacker-controlled header length to bypass optional-field early returns and cause the decoder to read beyond a short heap buffer. Opening the crafted document can crash SumatraPDF. This issue is fixed in version 3.6.
Related Weaknesses (CWE)
References
- https://github.com/sumatrapdfreader/sumatrapdf/commit/24b9ce83383bbaa48b3efe00e4
- https://github.com/sumatrapdfreader/sumatrapdf/issues/5318
- https://github.com/sumatrapdfreader/sumatrapdf/releases/tag/3.6rel
- https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-27p6-wrf
- https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-27p6-wrf
FAQ
What is CVE-2026-26054?
CVE-2026-26054 is a documented vulnerability. 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 deco...
How severe is CVE-2026-26054?
CVSS scoring is not yet available for CVE-2026-26054. Check NVD for updates.
Is there a patch for CVE-2026-26054?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.