CVE-2026-6637
Description
Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a "refint" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Windows Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 17.10-0+deb13u1 |
| sid | Fixed | 18.4-1 |
| forky | Fixed | 18.4-1 |
| bullseye | Affected | — |
| bookworm | Fixed | 15.18-0+deb12u1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| postgresql | postgresql | {"endExcluding":"14.23"} | 14.23 |
| postgresql | postgresql | {"startIncluding":"15.0","endExcluding":"15.18"} | 15.18 |
| postgresql | postgresql | {"startIncluding":"16.0","endExcluding":"16.14"} | 16.14 |
| postgresql | postgresql | {"startIncluding":"17.0","endExcluding":"17.10"} | 17.10 |
| postgresql | postgresql | {"startIncluding":"18.0","endExcluding":"18.4"} | 18.4 |
References
CWEs
CWE-89 CWE-121
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.