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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-130378 advisory.

    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

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8704-1 advisory.

    It was discovered that cpio incorrectly sanitized hard-link targets when extracting tar archives in copy-     in mode. If a user or automated system were tricked into extracting a specially crafted tar archive, an     attacker could possibly use this issue to create hard links to files outside the extraction directory,     even when using the --no-absolute-filenames option. (CVE-2026-66484)

    It was discovered that cpio did not properly bound the stack memory allocated for pathnames during archive     extraction. If a user or automated system were tricked into extracting a specially crafted cpio archive,     an attacker could possibly use this issue to cause cpio to crash, resulting in a denial of service.
    (CVE-2026-66485)

    It was discovered that cpio did not properly escape archive member names when listing archive contents. If     a user or automated system were tricked into listing a specially crafted archive, an attacker could     possibly use this issue to inject misleading output or malicious terminal control sequences.
    (CVE-2026-66486)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the cpio packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c.
    The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an     archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long     nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio     process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial     of service.

    This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9(CVE-2026-66485)

    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(CVE-2026-66486)

    GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When     extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name     is normalized but the tar hard-link target is passed to the link_to_name function without equivalent     sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link     entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create     a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee     of --no-absolute-filenames and allowing archive-controlled linkage to external files.

    This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad(CVE-2026-66484)

Tenable has extracted the preceding description block directly from the EulerOS cpio security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the cpio packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    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(CVE-2026-66486)

    GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When     extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name     is normalized but the tar hard-link target is passed to the link_to_name function without equivalent     sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link     entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create     a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee     of --no-absolute-filenames and allowing archive-controlled linkage to external files.

    This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad(CVE-2026-66484)

    GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c.
    The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an     archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long     nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio     process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial     of service.

    This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9(CVE-2026-66485)

Tenable has extracted the preceding description block directly from the EulerOS cpio security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The AlmaLinux 9.6 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1787310466 advisory.

  - GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c.
    The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an     archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long     nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio     process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial     of service. This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9 (CVE-2026-66485)

  - 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 (CVE-2026-66486)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The AlmaLinux 9.2 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1787337004 advisory.

  - GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c.
    The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an     archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long     nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio     process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial     of service. This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9 (CVE-2026-66485)

  - 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 (CVE-2026-66486)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 9.6 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1787310466 advisory.

  - GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c.
    The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an     archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long     nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio     process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial     of service. This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9 (CVE-2026-66485)

  - 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 (CVE-2026-66486)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4012-1 advisory.

    - CVE-2026-66484: improper sanitization in the tar archive extraction functionality allows for the     creation of hard       links outside intended directory via malicious tar archives (bsc#1274856).
    - CVE-2026-66485: improper memory management in the `make_path` function when allocating memory allows for     denial of       service via crafted archives (bsc#1274857).
    - CVE-2026-66486: improper encoding or escaping of output in the archive member listing functionality     allows for       terminal control sequence injection via crafted archive member names (bsc#1274858).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21747-1 advisory.

    - CVE-2026-66484: improper sanitization in the tar archive extraction functionality allows for the     creation of hard       links outside intended directory via malicious tar archives (bsc#1274856).
    - CVE-2026-66485: improper memory management in the `make_path` function when allocating memory allows for     denial of       service via crafted archives (bsc#1274857).
    - CVE-2026-66486: improper encoding or escaping of output in the archive member listing functionality     allows for       terminal control sequence injection via crafted archive member names (bsc#1274858).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0856 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2026-66486:
    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.

    CVE-2026-66485:
    GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c.
    The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an     archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long     nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio     process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial     of service.

    CVE-2026-66484:
    GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When     extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name     is normalized but the tar hard-link target is passed to the link_to_name function without equivalent     sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link     entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create     a hard link to an existing file outside the intended extraction directory.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 (CVE-2026-66486)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
366268	Unity Linux 20.1070e Security Update: cpio (UTSA-2026-130378)	Nessus	Unity Linux Local Security Checks	Local	medium
365388	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : GNU cpio vulnerabilities (USN-8704-1)	Nessus	Ubuntu Local Security Checks	Local	medium
364878	EulerOS 2.0 SP13 : cpio (EulerOS-SA-2026-4037)	Nessus	Huawei Local Security Checks	Local	medium
364807	EulerOS 2.0 SP13 : cpio (EulerOS-SA-2026-4128)	Nessus	Huawei Local Security Checks	Local	medium
364783	EulerOS 2.0 SP11 : cpio (EulerOS-SA-2026-4310)	Nessus	Huawei Local Security Checks	Local	medium
364751	EulerOS 2.0 SP11 : cpio (EulerOS-SA-2026-4219)	Nessus	Huawei Local Security Checks	Local	medium
353237	AlmaLinux 9.6 [TuxCare] Security Update: cpio Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1787310466)	Nessus	Alma Linux Local Security Checks	Local	medium
352737	AlmaLinux 9.2 [TuxCare] Security Update: cpio Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1787337004)	Nessus	Alma Linux Local Security Checks	Local	medium
352333	Rocky Linux 9.6 [TuxCare] Security Update: cpio Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1787310466)	Nessus	Rocky Linux Local Security Checks	Local	medium
348426	SUSE SLED15 / SLES15 Security Update : cpio (SUSE-SU-2026:4012-1)	Nessus	SuSE Local Security Checks	Local	medium
343942	openSUSE 16 Security Update : cpio (openSUSE-SU-2026:21747-1)	Nessus	SuSE Local Security Checks	Local	medium
339171	TencentOS Server 4: cpio (TSSA-2026:0856)	Nessus	Tencent Local Security Checks	Local	medium
334440	Linux Distros Unpatched Vulnerability : CVE-2026-66486	Nessus	Misc.	Local	medium

Detections

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CVE-2026-66486

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