CVE-2026-55783

unknowncovered by 1 sourcefirst seen 2026-07-10

NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.0, NanaZip's seven in-house IInArchive handlers in NanaZip.Codecs unconditionally dereference the caller-supplied Indices array inside Extract when the archive engine signals extract everything by passing Indices as NULL and NumItems as 0xFFFFFFFF. This causes a NULL pointer dereference in the standard Test archive or Extract all code path for WebAssembly, ElectronAsar, Zealfs, Romfs, Ufs, Littlefs, and DotNetSingleFile archives, resulting in a process crash. This issue is fixed in version 6.5.1749.0.

⚡ Watch CVE-2026-55783

Get an email if CVE-2026-55783 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Advisory coverage (1)

unknownCVE-2026-55783: NanaZip is the 7-Zip derivative intended for the modern Windows experience. Prior to 6.5.1749.…nvd · 2026-07-10

External references

NVD record for CVE-2026-55783

CVE.org record

Embed the live status

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2026-55783 status](https://www.csirts.com/badge/CVE-2026-55783)](https://www.csirts.com/cve/CVE-2026-55783)