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CVE-2026-66486

Improper Output Encoding in GNU cpio

MEDIUM
4.6
CVSS Score
Published: August 10, 2026 at 10:25 AM UTC
Updated: October 24, 2026 at 04:10 PM UTC
1 product affected across 1 vendorCpio

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Severity
MEDIUM4.6
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

GNU cpio is vulnerable to improper encoding or escaping of output in its archive member listing functionality. When listing archive members via cpio -it, member names are printed directly to output without quoting or escaping. An attacker can craft a cpio archive containing member names with embedded newline characters or ANSI escape sequences, causing forged listing entries or terminal control sequence injection when the listing is displayed. This issue has been fixed in commit 2ff9600c9ef32e88759843cdbde74c8db5ae9b30

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cpio· Gnu
85%
0 ≤ v ≤ 2.150

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Third Party Advisory
Source: cverecord
https://cert.pl/en/posts/2026/08/CVE-2026-66484
Product
Source: cverecord
https://git.savannah.gnu.org/cgit/cpio.git

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.6MEDIUMCERT-PL
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-116

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