Socket versions before 2.041 for Perl have an out-of-bounds heap read. In Socket.xs, pack_ip_mreq_source() checks the length of its source argument before the argument is read, so the check tests the byte length carried over from the preceding multiaddr argument instead. Both addresses occupy a 4-byte field, so a valid multiaddr lets a source of any length pass the check, and the source is then copied into the 4-byte imr_sourceaddr field with a fixed-size copy. A source shorter than 4 bytes is not rejected, and the copy reads up to 3 bytes past the end of its buffer. Calling pack_ip_mreq_source() with a source value shorter than 4 bytes copies adjacent heap memory into the returned packed structure.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-7df6c5acad advisory.

    2.041- BUGFIXES - Fix reuse of `STRLEN len` variable in pack_ip_mreq_source()



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

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

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-91d6cb99f7 advisory.

    2.041- BUGFIXES - Fix reuse of `STRLEN len` variable in pack_ip_mreq_source()



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

Note that Nessus has not tested for this issue 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.

  - Socket versions before 2.041 for Perl have an out-of-bounds heap read. In Socket.xs, pack_ip_mreq_source()     checks the length of its source argument before the argument is read, so the check tests the byte length     carried over from the preceding multiaddr argument instead. Both addresses occupy a 4-byte field, so a     valid multiaddr lets a source of any length pass the check, and the source is then copied into the 4-byte     imr_sourceaddr field with a fixed-size copy. A source shorter than 4 bytes is not rejected, and the copy     reads up to 3 bytes past the end of its buffer. Calling pack_ip_mreq_source() with a source value shorter     than 4 bytes copies adjacent heap memory into the returned packed structure. (CVE-2026-12087)

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

ID	Name	Product	Family	Severity
323846	Fedora 43 : perl-Socket (2026-7df6c5acad)	Nessus	Fedora Local Security Checks	critical
322853	Fedora 44 : perl-Socket (2026-91d6cb99f7)	Nessus	Fedora Local Security Checks	critical
321157	Linux Distros Unpatched Vulnerability : CVE-2026-12087	Nessus	Misc.	critical

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