isaacs node-tar up to 7.5.20 Files Filter src/list.ts filesFilter stack-based overflow

Summaryinfo

A vulnerability was found in isaacs node-tar up to 7.5.20. It has been rated as problematic. The affected element is the function filesFilter of the file src/list.ts of the component Files Filter. This manipulation causes stack-based overflow. This vulnerability is registered as CVE-2026-73566. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in isaacs node-tar up to 7.5.20. It has been declared as problematic. Affected by this vulnerability is the function filesFilter of the file src/list.ts of the component Files Filter. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect availability. The summary by CVE is:

node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.21, node-tar's filesFilter in src/list.ts uses the recursive mapHas helper to walk an archive entry path upward with path.dirname() and no segment cap when tar.t(...) or tar.x(...) receives a non-empty member-selection list. A crafted GNU L or PAX x long-path header with thousands of slash-separated segments reaches this.filter(entry.path, entry) in Parser[CONSUMEHEADER] in src/parse.ts before Unpack[CHECKPATH] applies maxDepth, causing an uncatchable RangeError stack overflow that terminates asynchronous and streaming Node.js consumers. This issue is fixed in version 7.5.21.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-73566 since 08/12/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available.

Upgrading to version 7.5.21 eliminates this vulnerability.

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Productinfo

Vendor

• isaacs

Name

• node-tar

Version

• 7.5.0
• 7.5.1
• 7.5.2
• 7.5.3
• 7.5.4
• 7.5.5
• 7.5.6
• 7.5.7
• 7.5.8
• 7.5.9
• 7.5.10
• 7.5.11
• 7.5.12
• 7.5.13
• 7.5.14
• 7.5.15
• 7.5.16
• 7.5.17
• 7.5.18
• 7.5.19
• 7.5.20

Website

• Product: https://github.com/isaacs/node-tar/

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