Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack. S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds. A template derived from untrusted input can read heap memory past the buffer and return it to the caller.

Multiple Vulnerabilities in Perl

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22847-1 advisory.

    - CVE-2025-15649: `IO:Uncompress:Unzip` propagates uncaught exception when parsing zip header with     malformed DOS date       (bsc#1266361).
    - CVE-2026-8376: heap buffer overflow when compiling regular expressions with a repeated fixed string on     32-bit builds       (bsc#1266304).
    - CVE-2026-12087: `Socket`'s `pack_ip_mreq_source()` can copy adjacent heap memory into the returned     packed structure       (bsc#1268349).
    - CVE-2026-57432: an integer overflow in `S_measure_struct` leads to an out-of-bounds heap read in `pack`     and `unpack`       (bsc#1271372).
    - CVE-2026-13221: regex trie branch-count overflow leads to silent false-positive/negative pattern     matching       (bsc#1271386).

Tenable has extracted the preceding description block directly from the SUSE 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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21411-1 advisory.

    - CVE-2025-15649: `IO:Uncompress:Unzip` propagates uncaught exception when parsing zip header with     malformed DOS date       (bsc#1266361).
    - CVE-2026-8376: heap buffer overflow when compiling regular expressions with a repeated fixed string on     32-bit builds       (bsc#1266304).
    - CVE-2026-12087: `Socket`'s `pack_ip_mreq_source()` can copy adjacent heap memory into the returned     packed structure       (bsc#1268349).
    - CVE-2026-57432: an integer overflow in `S_measure_struct` leads to an out-of-bounds heap read in `pack`     and `unpack`       (bsc#1271372).
    - CVE-2026-13221: regex trie branch-count overflow leads to silent false-positive/negative pattern     matching       (bsc#1271386).

Tenable has extracted the preceding description block directly from the SUSE 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.

  - Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds     heap read in pack and unpack. S_measure_struct adds each item's size times its repeat count to a running     total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed     SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length     comparison that passes when the length is negative, advancing the buffer pointer out of bounds. A template     derived from untrusted input can read heap memory past the buffer and return it to the caller.
    (CVE-2026-57432)

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

ID	Name	Product	Family	Severity
330290	SUSE SLES16 Security Update : perl (SUSE-SU-2026:22847-1)	Nessus	SuSE Local Security Checks	critical
329512	openSUSE 16 Security Update : perl (openSUSE-SU-2026:21411-1)	Nessus	SuSE Local Security Checks	critical
326568	Linux Distros Unpatched Vulnerability : CVE-2026-57432	Nessus	Misc.	high

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