CVE-2026-108518

01/Description

DBI versions before 1.656 for Perl crash via type confusion in dbi_profile when a database handle is destroyed under a Profile Path with an {attr} element. An {attr} element names a database handle attribute, which dbi_profile reads from the handle's inner hash. It expects the inner handle as a reference and dereferences it, but a handle that is being destroyed hands back the inner hash itself, so the dereference yields the hash's bucket array. A type check on that pointer usually fails and the call goes unprofiled. When the memory it addresses passes the check, the attribute lookup dereferences a NULL or invalid pointer and the process dies on SIGSEGV. The Path is set by the application, by the Profile handle attribute, or by the DBI_PROFILE environment variable, so `DBI_PROFILE={ImplementorClass}` can crash an unmodified program.

02/References5

• github.com/perl5-dbi/dbi/commit/c2ff4df575d7af625bb4d0d1ef7539f…
• github.com/perl5-dbi/dbi/security/advisories/GHSA-7393-6f8r-fhh3
• metacpan.org/release/HMBRAND/DBI-1.656/changes
• www.openwall.com/lists/oss-security/2026/10/20/37
• github.com/perl5-dbi/dbi/security/advisories/GHSA-7393-6f8r-fhh3