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
| Release | Package | Fixed 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
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Critical 9.1CVE-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
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-12087.html