When using the "configparser" module to write configuration files containing multi-line text values with carriage return characters (\r) the resulting file could be injected with unexpected keys and values if the attacker controls the written value.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1964 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)

    When using the configparser module to write configuration filescontaining multi-line text values with     carriage return characters (\r) theresulting file could be injected with unexpected keys and values if     theattacker controls the written value. (CVE-2026-0864)

    When using the tarfile module with a file opened in streaming mode (mode=r|) the tarfile module did     not properly handle EOF, making archive parsing take exponentially longer. (CVE-2026-11972)

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 ALAS2023-2026-1954 advisory.

    When using the configparser module to write configuration filescontaining multi-line text values with     carriage return characters (\r) theresulting file could be injected with unexpected keys and values if     theattacker controls the written value. (CVE-2026-0864)

    When using the tarfile module with a file opened in streaming mode (mode=r|) the tarfile module did     not properly handle EOF, making archive parsing take exponentially longer. (CVE-2026-11972)

    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)

    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)

    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 ALAS2023-2026-1963 advisory.

    When using the configparser module to write configuration filescontaining multi-line text values with     carriage return characters (\r) theresulting file could be injected with unexpected keys and values if     theattacker controls the written value. (CVE-2026-0864)

    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)

    When using the tarfile module with a file opened in streaming mode (mode=r|) the tarfile module did     not properly handle EOF, making archive parsing take exponentially longer. (CVE-2026-11972)

    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)

    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 ALAS2023-2026-1953 advisory.

    When using the configparser module to write configuration filescontaining multi-line text values with     carriage return characters (\r) theresulting file could be injected with unexpected keys and values if     theattacker controls the written value. (CVE-2026-0864)

    When using the tarfile module with a file opened in streaming mode (mode=r|) the tarfile module did     not properly handle EOF, making archive parsing take exponentially longer. (CVE-2026-11972)

    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)

    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.

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

  - When using the configparser module to write configuration files containing multi-line text values with     carriage return characters (\r) the resulting file could be injected with unexpected keys and values if     the attacker controls the written value. (CVE-2026-0864)

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

ID	Name	Product	Family	Severity
328491	Amazon Linux 2023 : python3.13, python3.13-devel, python3.13-freethreading (ALAS2023-2026-1964)	Nessus	Amazon Linux Local Security Checks	high
328487	Amazon Linux 2023 : python3.12, python3.12-devel, python3.12-idle (ALAS2023-2026-1954)	Nessus	Amazon Linux Local Security Checks	high
328474	Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1963)	Nessus	Amazon Linux Local Security Checks	high
328461	Amazon Linux 2023 : python3.11, python3.11-devel, python3.11-idle (ALAS2023-2026-1953)	Nessus	Amazon Linux Local Security Checks	high
323879	Linux Distros Unpatched Vulnerability : CVE-2026-0864	Nessus	Misc.	medium

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CVE-2026-0864

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medium