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Low ALAS2023-2026-2161 1 CVE

Low: perl-Socket security update (Amazon Linux 2023)

Published Sep 14, 2026 · Updated Sep 14, 2026

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-12087: 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.

Fixed packages 4

ReleasePackageFixed in
Amazon Linux · 2023 perl-Socket 4:2.032-1.amzn2023.0.4
Amazon Linux · 2023 perl-Socket-debuginfo 4:2.032-1.amzn2023.0.4
Amazon Linux · 2023 perl-Socket-debugsource 4:2.032-1.amzn2023.0.4
Amazon Linux · 2023 perl-Socket-tests 4:2.032-1.amzn2023.0.4

Vulnerabilities 1

  • Critical 9.1
    CVE-2026-12087 Public exploit

    Socket versions before 2.041 for Perl have an out-of-bounds heap read

    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 argum…

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-12087.html