{"id":"CVE-2026-12087","summary":"Socket versions before 2.041 for Perl have an out-of-bounds heap read","details":"Socket versions before 2.041 for Perl have an out-of-bounds heap read.\n\nIn 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.\n\nCalling pack_ip_mreq_source() with a source value shorter than 4 bytes copies adjacent heap memory into the returned packed structure.","modified":"2026-07-08T08:12:22.943621656Z","published":"2026-06-15T21:11:09.876Z","database_specific":{"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"fixed":"2.041"}]},{"source":"DESCRIPTION","extracted_events":[{"fixed":"2.041"}]}],"cna_assigner":"CPANSec","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12087.json","cwe_ids":["CWE-125","CWE-805"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/15/10"},{"type":"WEB","url":"https://cpan.org/modules"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12087.json"},{"type":"ADVISORY","url":"https://metacpan.org/release/PEVANS/Socket-2.041/changes"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-12087"},{"type":"FIX","url":"https://github.com/Perl/perl5/commit/de19a0b0ad1900fef976c5c1400bd8f11ec6c6cb.patch"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/perl/perl5","events":[{"introduced":"0"},{"fixed":"de19a0b0ad1900fef976c5c1400bd8f11ec6c6cb"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v5.43.10","v5.43.9","v5.43.8","v5.42.0","v5.43.6","v5.43.2","v5.43.1","v5.43.0","v5.42.0-RC3","v5.42.0-RC2","v5.42.0-RC1","v5.41.13","v5.41.12","v5.41.11","v5.41.10","v5.41.9","v5.41.8","v5.41.7","v5.41.5","v5.41.4","v5.41.3","v5.40.0","v5.41.2","v5.41.1","v5.41.0","v5.40.0-RC2","v5.40.0-RC1","v5.39.8","v5.39.7","v5.39.5","v5.39.4","v5.38.0","v5.39.3","v5.39.1","v5.39.0","v5.38.0-RC2","v5.38.0-RC1","v5.37.11","v5.37.10","v5.37.9","v5.37.7","v5.37.6","v5.37.5","v5.37.4","v5.37.3","v5.37.2","v5.37.1","v5.36.0","v5.37.0","v5.36.0-RC3","v5.35.11","v5.35.10","v5.34.0","v5.35.9","v5.35.8","v5.35.6","v5.35.5","v5.35.3","v5.35.0","v5.34.0-RC2","v5.34.0-RC1","v5.33.9","v5.33.8","v5.33.7","v5.32.0","v5.33.4","v5.33.3","v5.33.2","v5.33.1","v5.33.0","v5.32.0-RC1","v5.31.11","v5.31.7","v5.31.5","v5.30.0","v5.31.4","v5.31.3","v5.31.2","v5.31.1","v5.31.0","v5.30.0-RC2","v5.30.0-RC1","v5.29.10","v5.29.9","v5.29.8","v5.29.7","v5.29.6","v5.29.5","v5.28.0","v5.29.1","v5.29.0","v5.28.0-RC4","v5.28.0-RC3","v5.28.0-RC2","v5.28.0-RC1","v5.27.11","v5.27.10","v5.27.8","v5.27.7","v5.27.6","v5.27.5","v5.27.3","v5.26.0","v5.27.0","v5.26.0-RC2","v5.25.11","v5.25.9","v5.25.7","v5.25.5","v5.25.4","v5.25.3","v5.24.0","v5.25.2","v5.25.0","v5.24.0-RC5","v5.24.0-RC4","v5.24.0-RC3","v5.24.0-RC2","v5.24.0-RC1","v5.23.7","v5.23.6","v5.23.4","v5.23.3","if-0.0605","v5.23.2","v5.23.1","v5.23.0","v5.22.0","v5.22.0-RC2","v5.22.0-RC1","v5.21.11","if-0.0604","v5.21.10","v5.21.9","v5.21.8","v5.21.6","v5.21.5","v5.21.4","v5.21.1","v5.21.0","v5.20.0","v5.20.0-RC1","v5.19.11","v5.19.7","v5.19.5","v5.19.3","v5.19.2","if-0.0603","v5.19.1","v5.18.0","v5.19.0","v5.18.0-RC4","v5.18.0-RC3","v5.18.0-RC2","v5.18.0-RC1","v5.17.9","v5.17.8","v5.17.7.0","v5.17.7","v5.17.6","v5.17.4","v5.17.2","v5.17.0","v5.16.0","v5.16.0-RC2","v5.16.0-RC1","v5.15.9","v5.15.5","v5.15.4","v5.15.3","v5.15.2","v5.15.1","v5.15.0","v5.14.0","v5.14.0-RC3","v5.14.0-RC2","v5.14.0-RC1","v5.13.11","v5.13.10","v5.13.9","v5.13.8","v5.13.7","v5.13.6","v5.13.5","v5.13.4","v5.13.3","v5.13.2","v5.13.1","v5.12.0","v5.13.0","v5.12.0-RC5","v5.12.0-RC4","v5.12.0-RC3","v5.12.0-RC2","v5.12.0-RC1","v5.12.0-RC0","v5.11.5","v5.11.4","v5.11.3","v5.11.1","v5.11.0","GitLive-blead","v5.10.0","perl-5.9.5","perl-5.9.4","perl-5.9.3","perl-5.9.2","perl-5.9.1","perl-5.9.0","perl-5.8.0","perl-5.7.3","perl-5.7.2","perl-5.7.1","perl-5.7.0","perl-5.6.0","perl-5.005","perl-5.003","perl-5.002_01","perl-5.002","perl-5.001n","perl-5.001","perl-5.000o","perl-5.000","perl-5a9","perl-5a2","perl-4.0.36","perl-4.0.00","perl-3.044","perl-3.000","perl-2.0","perl-1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12087.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}