A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in an untrusted RPM package whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's independently-controlled cpio filesize field is used to write attacker-controlled data past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package.

amazon_alas ALAS2023-2026-3430: Amazon Linux 2023 Security Advisory:ALAS2023-2026-3430

The version of rpm installed on the remote host is prior to 4.14.3-4. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2MOCK2-2026-006 advisory.

    A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in an untrusted RPM package     whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in     iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's     independently-controlled cpio filesize field is used to write attacker-controlled data past the end of     that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an  untrusted package.
    (CVE-2026-95520)

    A command injection flaw was found in rpm. Installing or rebuilding a source RPM whose source or spec file     basenames contain a %() macro construct causes rpm to execute an attacker-controlled shell command via     popen() while relocating the source file list. This allows arbitrary command execution as the invoking     (typically non-root) user, simply by installing, rebuilding, or otherwise processing an untrusted     .src.rpm. (CVE-2026-95521)

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 AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1794008871 advisory.

  - A heap-based buffer overflow flaw was found in rpm. RPMTAG_FILESIGNATURES in a crafted, unsigned RPM     package's main header is declared with the wrong header type, causing hex2binv() to allocate a one-byte     buffer and then write the tag's attacker-controlled, hex-decoded content  of attacker-chosen length     past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an     untrusted package. (CVE-2026-103242)

  - A vulnerability was found in RPM's rpmbuild tarball processing. When processing a crafted source archive,     the getTarSpec() function in tools/rpmbuild.cc passes an attacker-controlled tar archive member name to     rpmExpand() as part of a %{basename:...} macro expression. A specially crafted .spec member name can     therefore inject RPM macros, including Lua expressions, resulting in arbitrary code execution with the     privileges of the user running rpmbuild. This can be exploited when a victim or automated build system     processes an attacker-controlled source tarball using rpmbuild tarball mode (such as -ts, -ta, or -tb).
    (CVE-2026-78367)

  - A flaw was found in rpm. An attacker can supply a crafted manifest file that, when processed by a user or     automation using `rpm -q -p` or similar manifest-processing flows, leads to arbitrary code execution. This     occurs because manifest entries are unexpectedly macro-expanded before being opened, allowing embedded     shell commands to run with the privileges of the `rpm` process. Successful exploitation can lead to a full     compromise of confidentiality, integrity, and availability for the affected account. (CVE-2026-95519)

  - A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in an untrusted RPM package     whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in     iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's     independently-controlled cpio filesize field is used to write attacker-controlled data past the end of     that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package.
    (CVE-2026-95520)

  - A flaw was found in rpm. An attacker can exploit a command injection vulnerability by influencing the path     or filename of a tarball processed by `rpmbuild -t*` to include shell metacharacters. This is particularly     relevant in automated build or continuous integration (CI) workflows that ingest externally supplied     artifact names. Successful exploitation allows for arbitrary command execution with the privileges of the     build user, which could lead to information disclosure or disruption of the build environment.
    (CVE-2026-84837)

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.

  - A heap-based buffer overflow flaw was found in rpm. Parsing a symlink entry in an untrusted RPM package     whose declared RPMTAG_LONGFILESIZES value is 0xFFFFFFFFFFFFFFFF causes an integer overflow in     iterReadArchiveNext() that shrinks a buffer allocation to one byte, after which the payload's     independently-controlled cpio filesize field is used to write attacker-controlled data past the end of     that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package.
    (CVE-2026-95520)

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

ID	Name	Product	Family	Type	Severity
379827	Amazon Linux 2 : rpm (ALASMOCK2-2026-006)	Nessus	Amazon Linux Local Security Checks	Local	high
377128	AlmaLinux 9.2 [TuxCare] Security Update: python3-rpm / rpm / rpm-apidocs / rpm-build / rpm-build-libs / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1794008871)	Nessus	Alma Linux Local Security Checks	Local	high
351185	Linux Distros Unpatched Vulnerability : CVE-2026-95520	Nessus	Misc.	Local	high

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