UBUNTU-CVE-2026-12087

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UBUNTU-CVE-2026-12087

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2026-12087, https://www.cve.org/CVERecord?id=CVE-2026-12087, https://lists.security.metacpan.org/cve-announce/msg/41020451/, https://ubuntu.com/security/notices/USN-8675-1, https://ubuntu.com/security/notices/USN-8684-1, https://ubuntu.com/security/notices/USN-8675-2