# CVE-2026-119923: Heap-based Buffer Overflow in Babelfish for PostgreSQL TDS Prelogin Parser

> CVE-2026-119923: Heap-based Buffer Overflow in Babelfish for PostgreSQL TDS Prelogin Parser. CVSS 9.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-119923
Last updated: 2026-11-07T22:16:34Z

- Published: 2026-11-06 18:35 UTC · Updated: 2026-11-07 22:16 UTC · Assigner: AMZN
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.62%, 50th percentile (scored 2026-11-10)
- CISA KEV: no
- CWE: CWE-122

## Description

A heap-based buffer overflow in the TDS prelogin parser in the Babelfish for PostgreSQL extension versions 1.0-1.5, 2.1-2.15, 3.1-3.12, 4.0-4.8, 5.1-5.4 and in Amazon Aurora PostgreSQL with Babelfish might allow remote attackers to execute arbitrary OS commands as the database process user via a specially crafted malformed TDS prelogin packet to the TDS port. This record consolidates a related NULL-pointer-dereference finding in the same prelogin parser. To remediate this issue, we recommend users upgrade to Babelfish for PostgreSQL extension versions 4.10, 5.6, 6.1 or later. As a workaround, restrict network access to the TDS port (default 1433). Customers using Amazon Aurora PostgreSQL with Babelfish should upgrade their cluster to Aurora PostgreSQL 13.9.16 (1.5.5), 13.23.3 (1.17.2), 14.6.16 (2.3.5), 14.17.8 (2.12.4), 14.18.6 (2.13.3), 14.19.5 (2.14.2), 14.20.5 (2.15.2), 14.22.3 (2.16.1), 14.23.1 (2.17.0), 15.10.8 (3.8.4), 15.12.8 (3.9.4), 15.13.6 (3.10.3), 15.14.5 (3.11.2), 15.15.5 (3.12.2), 15.17.3 (3.13.1), 15.18.1 (3.14.0), 16.8.8 (4.5.5), 16.9.6 (4.6.3), 16.10.5 (4.7.2), 16.11.5 (4.8.2), 16.13.3 (4.9.1), 16.14.1 (4.10.0), 17.4.8 (5.1.4), 17.5.6 (5.2.3), 17.6.5 (5.3.2), 17.7.5 (5.4.2), 17.9.3 (5.5.1), 17.10.1 (5.6.0), 18.3.4 (6.0.2), 18.4.1 (6.1.0) or later, and apply any pending maintenance to ensure they are on the latest patch.

## Affected vendors and products

- Amazon: Amazon Aurora PostgreSQL with Babelfish
- AWS: babelfish-for-postgresql

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-119923)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-119923)
- [https://aws.amazon.com/security/security-bulletins/2026-166-aws/](https://aws.amazon.com/security/security-bulletins/2026-166-aws/)
- [https://github.com/babelfish-for-postgresql/babelfish\_extensions/security/advisories/GHSA-vq28-vgj3-r26w](https://github.com/babelfish-for-postgresql/babelfish_extensions/security/advisories/GHSA-vq28-vgj3-r26w)
- [https://github.com/babelfish-for-postgresql/babelfish-for-postgresql/releases/tag/BABEL\_4\_10\_0\_\_PG\_16\_14](https://github.com/babelfish-for-postgresql/babelfish-for-postgresql/releases/tag/BABEL_4_10_0__PG_16_14)
- [https://github.com/babelfish-for-postgresql/babelfish-for-postgresql/releases/tag/BABEL\_5\_6\_0\_\_PG\_17\_10](https://github.com/babelfish-for-postgresql/babelfish-for-postgresql/releases/tag/BABEL_5_6_0__PG_17_10)
- [https://github.com/babelfish-for-postgresql/babelfish-for-postgresql/releases/tag/BABEL\_6\_1\_0\_\_PG\_18\_4](https://github.com/babelfish-for-postgresql/babelfish-for-postgresql/releases/tag/BABEL_6_1_0__PG_18_4)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-119923 · Markdown: https://rewindex.com/cve/CVE-2026-119923.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-119923 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-11T04:59:35.133Z