{"id":"CVE-2026-107738","published":"2026-10-08T23:16:59.970","lastModified":"2026-10-14T02:16:58.240","description":"SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, ChmFile::GetCharZ() narrows file-controlled unsigned string offsets from /#WINDOWS and /#IVB to signed integers without a lower-bound check. An offset that becomes negative can make the function read before the /#STRINGS buffer, causing deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-125"],"vendors":[],"products":[],"references":[{"url":"https://github.com/sumatrapdfreader/sumatrapdf/commit/62254ed6d781ceb5cd16489bb423e7f591cd72c4","tags":[]},{"url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-33jg-vxm6-8mxx","tags":[]}],"exploitRefs":[{"url":"https://github.com/sumatrapdfreader/sumatrapdf/commit/62254ed6d781ceb5cd16489bb423e7f591cd72c4","tags":[]},{"url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-33jg-vxm6-8mxx","tags":[]}],"hasPoc":true,"ai":null}