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CVE-2026-66485 is an uncontrolled memory allocation vulnerability in GNU cpio affecting versions through 2.15. The flaw is located in the make_path function in src/makepath.c, where stack memory is allocated with alloca based on the length of argpath. During archive extraction, argpath is derived from a pathname fully controlled by archive contents. A crafted cpio archive containing a sufficiently long nested pathname can therefore trigger an unbounded stack allocation on the process stack, leading to stack overflow and termination of the cpio process. The issue is exploitable during extraction of malicious archives and results in denial of service.
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No public exploit code observed for this vulnerability.
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An uncontrolled memory allocation vulnerability in GNU cpio that can trigger unbounded stack allocation via a crafted archive pathname, causing stack overflow and denial of service.
A vulnerability reported by CERT Polska as affecting GNU cpio software.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.