Executive brief
pgcollection is a PostgreSQL extension that stores and manages collections of data within databases. A type confusion vulnerability allows authenticated database users to request stored values in incompatible formats, causing the extension to misinterpret the data representation. This can lead to denial of service by crashing the database backend or, in more severe cases, arbitrary code execution with database privileges.
Technical details
CVE-2026-96883 is a type confusion vulnerability in pgcollection's type coercion logic affecting versions 2.0.0 through 2.1.1. The vulnerability arises when an authenticated database user requests an icollection value using a type incompatible with how the value was stored, causing the extension to misinterpret the datum's binary representation. This type confusion can lead to out-of-bounds memory access or control flow hijacking, enabling a database-authenticated attacker to crash the PostgreSQL backend or execute arbitrary code within the database process context. No patch information is currently available in the advisory, though the vendor (AWS) was aware of the issue as of the publication date.
Affected products
- AWS pgcollection 2.0.0 through 2.1.1
Timeline
- 2026-09-24: disclosed: AWS security bulletin 2026-118-AWS published