CVE•Published 2026-05-09•Modified 2026-05-14•1 article on news•5 live references•NVD data

CVE-2026-6665Pgbouncer · Pgbouncer

Vulnerability data via NVD (ingested)

CVSS v3.1

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

—

Weaknesses (CWE)

CWE-121Stack-based Buffer Overflow

Description

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

Timeline

Published 2026-05-09

Modified 2026-05-14

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-6665

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Pgbouncer Pgbouncer"

All exposed Pgbouncer Pgbouncer instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Pgbouncer"

HTTP body or banner mentions "Pgbouncer" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-6665