CVE-2026-116489

Description

Timescale pgvectorscale before 0.9.1 contains a type confusion vulnerability that allows low-privileged database users to corrupt memory by shadowing pgvector's vector type or operators. Attackers with CREATE privilege on the vectorscale schema can pre-create shadow objects, then build and query DiskANN indexes over crafted values to cause out-of-bounds reads and writes, disclosing memory, crashing the server, or escalating privileges.

References

• https://github.com/timescale/pgvectorscale
• https://github.com/timescale/pgvectorscale/blob/0.9.0/pgvectorscale/src/access_method/build.rs#L253
• https://github.com/timescale/pgvectorscale/blob/0.9.0/pgvectorscale/src/access_method/mod.rs#L208-L231
• https://github.com/timescale/pgvectorscale/blob/0.9.0/pgvectorscale/src/access_method/pg_vector.rs#L133-L151
• https://github.com/timescale/pgvectorscale/commit/1c7cb1cab919ac122f901f163a71f69a264a8f81