{"id":"CVE-2026-6665","state":"PUBLISHED","title":"PgBouncer buffer overflow in SCRAM","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.","publishedAt":"2026-05-09T00:43:46.762Z","updatedAt":"2026-05-12T03:55:19.823Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"PostgreSQL"},"assigner":"PostgreSQL","products":["n/a PgBouncer"],"affected":[{"vendor":"n/a","product":"PgBouncer","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.25.2","versionType":"semver"}]}],"references":["https://www.pgbouncer.org/changelog.html#pgbouncer-125x"],"weaknesses":["CWE-121"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/6xxx/CVE-2026-6665.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6665","state":"PUBLISHED","datePublished":"2026-05-09T00:43:46.762Z","dateUpdated":"2026-05-12T03:55:19.823Z","assignerShortName":"PostgreSQL","assignerOrgId":"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007","dateReserved":"2026-04-20T12:25:43.793Z"},"containers":{"cna":{"title":"PgBouncer buffer overflow in SCRAM","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"PgBouncer","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.25.2","versionType":"semver"}]}],"references":[{"url":"https://www.pgbouncer.org/changelog.html#pgbouncer-125x"}],"metrics":[{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.1,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-121","lang":"en","type":"CWE","description":"Stack-based Buffer Overflow"}]}],"providerMetadata":{"shortName":"PostgreSQL","orgId":"f86ef6dc-4d3a-42ad-8f28-e6d5547a5007","dateUpdated":"2026-05-09T00:43:46.762Z"},"credits":[{"lang":"en","value":"Thanks to HarutoKimura for finding and reporting this problem.","type":"finder"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-11T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-6665"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-12T03:55:19.823Z"}}]}}}