Bug 2560633

Summary: CVE-2026-106070 nodejs26: Node.js: Security inspection bypass via crafted ZIP archive header mismatch [fedora-rawhide]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: nodejs26Assignee: Jan Staněk <jstanek>
Status: NEW --- QA Contact:
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Version: rawhideCC: aradchen, jstanek, tjuhasz
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Whiteboard: {"flaws": ["5252606f-174f-4bf9-9c09-c6c575c31c9a"]}
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Bug Blocks: 2560020    

Description Srikanth Balasubramanian 2026-10-26 12:43:02 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw in the Node.js `zlib.ZipFile` API can cause it to return bytes that do not belong to the requested entry after the local and central header validation fails.

When `zipEntry.modified` is read on an archive whose local header does not match its central directory, either directly or while compacting the archive, the validation error is caught but the parsed local header is left cached without a content offset. A later content read then returns attacker-controlled bytes from the start of the file instead of rejecting the archive, and CRC-32 verification still passes because the attacker controls the central directory CRC. A Node.js-based scanner can therefore approve different content from what another ZIP implementation extracts from the same archive.

This vulnerability affects Node.js **26.x**.