APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack particularly on platforms without crypt() such as Windows, BeOS, NetWare, or Android. Users are recommended to upgrade to version 1.6.4, which fixes this issue.

The remote Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4742 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4742-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Bastien Roucaris     August 16, 2026                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : apr-util     Version        : 1.6.1-5+deb11u2 1.6.3-1+deb12u1     CVE ID         : CVE-2025-49506 CVE-2026-32327 CVE-2026-34191 CVE-2026-34501                      CVE-2026-34502     Debian Bug     : 1143837


    Several vulnerabilities were discovered in apr-util, the Apache Portable     Runtime Utility library, which could result in denial of service or     potentially the execution of arbitrary code.

    For Debian 11 bullseye, these problems have been fixed in version     1.6.1-5+deb11u2.

    For Debian 12 bookworm, these problems have been fixed in version     1.6.3-1+deb12u1.

    We recommend that you upgrade your apr-util packages.

    For the detailed security status of apr-util please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/apr-util

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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 Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6437 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6437-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     August 13, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : apr-util     CVE ID         : CVE-2025-49506 CVE-2026-32327 CVE-2026-34501 CVE-2026-34502     Debian Bug     : 1143837

    Several vulnerabilities were discovered in apr-util, the Apache Portable     Runtime Utility library, which could result in denial of service or     potentially the execution of arbitrary code.

    For the stable distribution (trixie), these problems have been fixed in     version 1.6.3-3+deb13u1.

    We recommend that you upgrade your apr-util packages.

    For the detailed security status of apr-util please refer to its     security tracker page at:
    https://security-tracker.debian.org/tracker/apr-util

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

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

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

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards
    to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack
    particularly on platforms without crypt() such as Windows, BeOS, NetWare, or Android. Users are
    recommended to upgrade to version 1.6.4, which fixes this issue. (CVE-2025-49506)

  - A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer
    which parses XML from untrusted sources and uses the apr_xml_quote_elem() function. Users are recommended
    to upgrade to version 1.6.4, which fixes this issue. (CVE-2026-32327)

  - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in
    Apache Portable Runtime Utility via apr_dbd_oracle provider. This issue affects Apache Portable Runtime
    Utility: from 1.6.0 through 1.6.3 (CVE-2026-34191)

  - Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility redis client. This issue
    affects Apache Portable Runtime Utility: from 1.6.0 through 1.6.3. Users are recommended to upgrade to
    version 1.6.4, which fixes the issue. (CVE-2026-34501)

  - Heap-based Buffer Overflow vulnerability in Apache Portable Runtime Utility memcached client This issue
    affects Apache Portable Runtime Utility: from 1.3.0 through 1.6.3. (CVE-2026-34502)

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

  - APR-util versions 1.6.3 (and earlier) function apr_password_validate() was not constant-time with regards     to hashes or passwords comparisons, potentially leaking their content via a side channel timing attack     particularly on platforms without crypt() such as Windows, BeOS, NetWare, or Android. Users are     recommended to upgrade to version 1.6.4, which fixes this issue. (CVE-2025-49506)

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

ID	Name	Product	Family	Type	Severity
335907	Debian dla-4742 : libaprutil1 - security update	Nessus	Debian Local Security Checks	Local	critical
335213	Debian dsa-6437 : libaprutil1-dbd-mysql - security update	Nessus	Debian Local Security Checks	Local	critical
445793	Alpine: multiple apr-util packages: security update to 1.6.4-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
445793	Alpine: multiple apr-util packages: security update to 1.6.4-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
333187	Linux Distros Unpatched Vulnerability : CVE-2025-49506	Nessus	Misc.	Local	high

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CVE-2025-49506

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Tenable Plugins

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high