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.
References10
- github.com/timescale/pgvectorscale
- github.com/timescale/pgvectorscale/blob/0.9.0/pgvectorscale/src…
- github.com/timescale/pgvectorscale/blob/0.9.0/pgvectorscale/src…
- github.com/timescale/pgvectorscale/blob/0.9.0/pgvectorscale/src…
- github.com/timescale/pgvectorscale/commit/1c7cb1cab919ac122f901…
- github.com/timescale/pgvectorscale/commit/59d2f573dbd7a1446728a…
- github.com/timescale/pgvectorscale/commit/f42f8cf29c92111add863…
- github.com/timescale/pgvectorscale/pull/280
- github.com/timescale/pgvectorscale/releases/tag/0.9.1
- www.vulncheck.com/advisories/timescale-pgvectorscale-before-0.9…
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
7.7
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 43 · as of 8 November 2026
- CWE
- CWE-843
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.