An issue was discovered in matio 1.5.28. A heap-based memory corruption can occur in Mat_VarCreateStruct() when the nfields value does not match the actual number of strings in the fields array. This leads to out-of-bounds reads and invalid memory frees during cleanup, potentially causing a segmentation fault or heap corruption.

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4644 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4644-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Andreas Henriksson     June 24, 2026                                 https://wiki.debian.org/LTS
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    Package        : libmatio     Version        : 1.5.23-2+deb12u1     CVE ID         : CVE-2025-2337 CVE-2025-2338 CVE-2025-50343     Debian Bug     : 1100992 1104247 1124797

    Multiple vulnerabilities has been discovered in libmatio, a MAT File I/O     Library.

    CVE-2025-2337

      A vulnerability, which was classified as critical, has been found in       libmatio Mat_VarPrint function. The manipulation leads to heap-based buffer       overflow. The attack may be initiated remotely. The exploit has been       disclosed to the public and may be used.

    CVE-2025-2338

      A Denial of Service (DoS) and head-based buffer overflow was found, which       could potentially lead to remote code execution if libmatio is embedded in       services that accepts user-supplied .mat files.

    CVE-2025-50343

      A Denial of Service (DoS) and in certain cases heap corruption vulnerability       was found, which could lead to potential remote code execution if libmatio is       embedded in services that accepts user-supplied .mat files.

    For Debian 12 bookworm, these problems have been fixed in version     1.5.23-2+deb12u1.

    For Debian 11 bullseye, see separate DLA-4459-1.

    We recommend that you upgrade your libmatio packages.

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

    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     Attachment:
    signature.asc     Description: PGP signature

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 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4459 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4459-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Andreas Henriksson     January 29, 2026                              https://wiki.debian.org/LTS
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    Package        : libmatio     Version        : 1.5.19-2+deb11u1     CVE ID         : CVE-2022-1515 CVE-2025-2338 CVE-2025-50343     Debian Bug     : 1104247 1124797


    Multiple vulnerabilities has been discovered in libmatio, a MAT File I/O     Library.

    CVE-2025-50343       A Denial of Service (DoS) and in certain cases heap corruption vulnerability       was found, which could lead to potential remote code execution if libmatio is       embedded in services that accepts user-supplied .mat files.

    CVE-2025-2338       A Denial of Service (DoS) and head-based buffer overflow was found, which       could potentially lead to remote code execution if libmatio is embedded in       services that accepts user-supplied .mat files.

    CVE-2022-1515       A memory leak was discovered in matio 1.5.21 and earlier. This could lead       to a potential Denial of Service (DoS).

    CVE-2020-36428      A heap-based buffer overflow was found which could lead to potential remote      code execution if libmatio is embedded in services that accepts user-supplied      .mat files.

    Additionally CVE-2025-2337 and CVE-2020-36428 was investigated and deemed     not to apply (directly) to this libmatio version.

    For Debian 11 bullseye, these problems have been fixed in version     1.5.19-2+deb11u1.

    We recommend that you upgrade your libmatio packages.

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

    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     Attachment:
    signature.asc     Description: PGP signature

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

  - An issue was discovered in matio 1.5.28. A heap-based memory corruption can occur in Mat_VarCreateStruct()     when the nfields value does not match the actual number of strings in the fields array. This leads to out-     of-bounds reads and invalid memory frees during cleanup, potentially causing a segmentation fault or heap     corruption. (CVE-2025-50343)

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

ID	Name	Product	Family	Type	Severity
322406	Debian dla-4644 : libmatio-dev - security update	Nessus	Debian Local Security Checks	Local	medium
297142	Debian dla-4459 : libmatio-dev - security update	Nessus	Debian Local Security Checks	Local	medium
280736	Linux Distros Unpatched Vulnerability : CVE-2025-50343	Nessus	Misc.	Local	critical

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CVE-2025-50343

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