tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory. This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1930 advisory.

    The tarfile module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while     processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK. This could result in a     crafted tar archive being misinterpreted by the tarfile module compared to other implementations.
    (CVE-2025-13462)

    tarfile.extractall() with the 'data' or 'tar'filter could be bypassed by a crafted archive where a     hardlinkreferences a symlink stored at a deeper name than the hardlink itself.The extraction fallback     validated the symlink at it's archived locationbut recreated it at the hardlink's shallowerpath, letting a     relativetarget the filter judged contained escape the destination directory.This allowed a malicious tar     archive to create a symlink pointingoutside the destination, enabling out-of-destination file reads     orwrites. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

    `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding     protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this     vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch. (CVE-2026-7210)

    The ftpcp() function in Lib/ftplib.py was not updated whenCVE-2021-4189 was fixed. While makepasv() was     patched to replaceserver-supplied PASV host addresses with the actual peer address(getpeername()[0]),     ftpcp() still calls parse227() directly and passesthe raw attacker-controllable IP address and port to     target.sendport(). This patch is related to CVE-2021-4189. (CVE-2026-8328)

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

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1931 advisory.

    The tarfile module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while     processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK. This could result in a     crafted tar archive being misinterpreted by the tarfile module compared to other implementations.
    (CVE-2025-13462)

    tarfile.extractall() with the 'data' or 'tar'filter could be bypassed by a crafted archive where a     hardlinkreferences a symlink stored at a deeper name than the hardlink itself.The extraction fallback     validated the symlink at it's archived locationbut recreated it at the hardlink's shallowerpath, letting a     relativetarget the filter judged contained escape the destination directory.This allowed a malicious tar     archive to create a symlink pointingoutside the destination, enabling out-of-destination file reads     orwrites. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

    `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding     protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this     vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch. (CVE-2026-7210)

    The ftpcp() function in Lib/ftplib.py was not updated whenCVE-2021-4189 was fixed. While makepasv() was     patched to replaceserver-supplied PASV host addresses with the actual peer address(getpeername()[0]),     ftpcp() still calls parse227() directly and passesthe raw attacker-controllable IP address and port to     target.sendport(). This patch is related to CVE-2021-4189. (CVE-2026-8328)

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

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1910 advisory.

    tarfile.extractall() with the 'data' or 'tar'filter could be bypassed by a crafted archive where a     hardlinkreferences a symlink stored at a deeper name than the hardlink itself.The extraction fallback     validated the symlink at it's archived locationbut recreated it at the hardlink's shallowerpath, letting a     relativetarget the filter judged contained escape the destination directory.This allowed a malicious tar     archive to create a symlink pointingoutside the destination, enabling out-of-destination file reads     orwrites. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

    CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host. (CVE-2026-1502)

    unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input     containing long runs of combining characters with alternating Canonical Combining Class values. This     affects all normalization forms. (CVE-2026-3276)

    `xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding     protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this     vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch. (CVE-2026-7210)

    tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or     directory-like names, to redirect later archive members outside the intended extraction directory. This     allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination     directory, subject to the permissions of the extracting process. (CVE-2026-7774)

    The ftpcp() function in Lib/ftplib.py was not updated whenCVE-2021-4189 was fixed. While makepasv() was     patched to replaceserver-supplied PASV host addresses with the actual peer address(getpeername()[0]),     ftpcp() still calls parse227() directly and passesthe raw attacker-controllable IP address and port to     target.sendport(). This patch is related to CVE-2021-4189. (CVE-2026-8328)

    bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the     resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to     resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash     the process when processing untrusted data. (CVE-2026-9669)

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

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1929 advisory.

    tarfile.extractall() with the 'data' or 'tar'filter could be bypassed by a crafted archive where a     hardlinkreferences a symlink stored at a deeper name than the hardlink itself.The extraction fallback     validated the symlink at it's archived locationbut recreated it at the hardlink's shallowerpath, letting a     relativetarget the filter judged contained escape the destination directory.This allowed a malicious tar     archive to create a symlink pointingoutside the destination, enabling out-of-destination file reads     orwrites. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

    unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input     containing long runs of combining characters with alternating Canonical Combining Class values. This     affects all normalization forms. (CVE-2026-3276)

    tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or     directory-like names, to redirect later archive members outside the intended extraction directory. This     allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination     directory, subject to the permissions of the extracting process. (CVE-2026-7774)

    The ftpcp() function in Lib/ftplib.py was not updated whenCVE-2021-4189 was fixed. While makepasv() was     patched to replaceserver-supplied PASV host addresses with the actual peer address(getpeername()[0]),     ftpcp() still calls parse227() directly and passesthe raw attacker-controllable IP address and port to     target.sendport(). This patch is related to CVE-2021-4189. (CVE-2026-8328)

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

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

An update of the python3 package has been released.

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

  - tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a     hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback     validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting     a relative target the filter judged contained escape the destination directory. This allowed a malicious     tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads     or writes. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

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

ID	Name	Product	Family	Severity
327402	Amazon Linux 2023 : python3.11, python3.11-devel, python3.11-idle (ALAS2023-2026-1930)	Nessus	Amazon Linux Local Security Checks	high
327389	Amazon Linux 2023 : python3.12, python3.12-devel, python3.12-idle (ALAS2023-2026-1931)	Nessus	Amazon Linux Local Security Checks	high
327378	Amazon Linux 2023 : python3.13, python3.13-devel, python3.13-freethreading (ALAS2023-2026-1910)	Nessus	Amazon Linux Local Security Checks	high
327372	Amazon Linux 2023 : python3.14, python3.14-devel, python3.14-freethreading (ALAS2023-2026-1929)	Nessus	Amazon Linux Local Security Checks	high
325083	Photon OS 4.0: Python3 PHSA-2026-4.0-1049	Nessus	PhotonOS Local Security Checks	critical
324561	Photon OS 5.0: Python3 PHSA-2026-5.0-0910	Nessus	PhotonOS Local Security Checks	high
323882	Linux Distros Unpatched Vulnerability : CVE-2026-11940	Nessus	Misc.	high

Detections

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CVE-2026-11940

high

Tenable Plugins

high

high

high

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critical

high

high