CVE-2026-32286 Denial of service in github.com/jackc/pgproto3/v2
A malicious PostgreSQL server can cause a client application panic by sending a DataRow message with a negative field length.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-32286?
CVE-2026-32286 is a high-severity denial of service vulnerability in github.com/jackc/pgproto3/v2, published on 26 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The DataRow.Decode function fails to properly validate field lengths. A malicious or compromised PostgreSQL server can send a DataRow message with a negative field length, causing a slice bounds out of range panic.
Which versions are affected by CVE-2026-32286?
3 open source packages ship an affected version, including github.com/jackc/pgproto3/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/jackc/pgproto3/v2 Go | From 2.0.0 | None |
github.com/jackc/pgproto3/v2 Go | From 2.0.0 to 2.3.3 | None |
github.com/jackc/pgproto3/v2 Go | From 2.0.0 to 2.3.3 | None |
Products include Jackc Pgproto3.
How do I fix CVE-2026-32286?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-32286 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-32286 exists.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in github.com/jackc/pgproto3/v2
Sources
Also known as CLEANSTART-2026-LY29111, CLEANSTART-2026-PO98584, CVE-2026-4427, DEBIAN-CVE-2026-32286, GHSA-jqcq-xjh3-6g23, GO-2026-4518 and 32 more.