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CVE-2026-66486 is an improper encoding or escaping of output vulnerability in GNU cpio affecting archive member listing functionality in versions through 2.15. When archive contents are listed with cpio -it, member names are written directly to output without quoting or escaping. Because the displayed name is archive-controlled, a crafted cpio archive can include member names containing embedded newline characters or ANSI escape sequences. This can cause forged listing entries to appear in the output or inject terminal control sequences when the listing is viewed.
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What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
cpio -it on untrusted archives in interactive terminals until the fix is applied. If inspection is necessary, perform it in a non-interactive or sanitized output environment that neutralizes control characters and escape sequences, and treat archive member names as untrusted data.Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An output encoding/escaping flaw in GNU cpio archive listing that allows crafted member names with newlines or ANSI escape sequences to forge listing entries or inject terminal control sequences.
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.