CVE-2026-119923

Heap-based Buffer Overflow in Babelfish for PostgreSQL TDS Prelogin Parser

Published Nov 6, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed

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 Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

AWS

babelfish-for-postgresql

unaffected

Version	Status	Constraints
`1.0`	affected	≤ 1.5
`2.1`	affected	≤ 2.15
`3.1`	affected	≤ 3.12
`4.0`	affected	≤ 4.8
`5.1`	affected	≤ 5.4

Amazon

Amazon Aurora PostgreSQL with Babelfish

unaffected

Version	Status	Constraints
`1.0.0`	affected	< 1.5.5
`1.6.0`	affected	< 1.17.2
`2.0.0`	affected	< 2.3.5
`2.4.0`	affected	< 2.12.4
`2.13.0`	affected	< 2.13.3
`2.14.0`	affected	< 2.14.2
`2.15.0`	affected	< 2.15.2
`2.16.0`	affected	< 2.16.1
`3.0.0`	affected	< 3.8.4
`3.9.0`	affected	< 3.9.4
`3.10.0`	affected	< 3.10.3
`3.11.0`	affected	< 3.11.2
`3.12.0`	affected	< 3.12.2
`3.13.0`	affected	< 3.13.1
`4.0.0`	affected	< 4.5.5
`4.6.0`	affected	< 4.6.3
`4.7.0`	affected	< 4.7.2
`4.8.0`	affected	< 4.8.2
`4.9.0`	affected	< 4.9.1
`5.0.0`	affected	< 5.1.4
`5.2.0`	affected	< 5.2.3
`5.3.0`	affected	< 5.3.2
`5.4.0`	affected	< 5.4.2
`5.5.0`	affected	—
`6.0.0`	affected	< 6.0.2

No data.

Vendor Product Versions

Amazon

Amazon Aurora Postgresql With Babelfish

Version	Status	Scheme	Platform
`[1.0.0,1.5.5)`	affected	semver	—
`[1.6.0,1.17.2)`	affected	semver	—
`[2.0.0,2.3.5)`	affected	semver	—
`[2.4.0,2.12.4)`	affected	semver	—
`[2.13.0,2.13.3)`	affected	semver	—
`[2.14.0,2.14.2)`	affected	semver	—
`[2.15.0,2.15.2)`	affected	semver	—
`[2.16.0,2.16.1)`	affected	semver	—
`[3.0.0,3.8.4)`	affected	semver	—
`[3.9.0,3.9.4)`	affected	semver	—
`[3.10.0,3.10.3)`	affected	semver	—
`[3.11.0,3.11.2)`	affected	semver	—
`[3.12.0,3.12.2)`	affected	semver	—
`[3.13.0,3.13.1)`	affected	semver	—
`[4.0.0,4.5.5)`	affected	semver	—
`[4.6.0,4.6.3)`	affected	semver	—
`[4.7.0,4.7.2)`	affected	semver	—
`[4.8.0,4.8.2)`	affected	semver	—
`[4.9.0,4.9.1)`	affected	semver	—
`[5.0.0,5.1.4)`	affected	semver	—
`[5.2.0,5.2.3)`	affected	semver	—
`[5.3.0,5.3.2)`	affected	semver	—
`[5.4.0,5.4.2)`	affected	semver	—
`5.5.0`	affected	semver	—
`[6.0.0,6.0.2)`	affected	semver	—

Aws

Babelfish-for-postgresql

Version	Status	Scheme	Platform
`[1.0,1.5]`	affected	generic	—
`[2.1,2.15]`	affected	generic	—
`[3.1,3.12]`	affected	generic	—
`[4.0,4.8]`	affected	generic	—
`[5.1,5.4]`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.621% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact total

References

Link	Providers
https://aws.amazon.com/security/security-bulletins/2026-166-aws/
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_6_1_0__PG_18_4
https://github.com/babelfish-for-postgresql/babelfish_extensions/security/advisories/GHSA-vq28-vgj3-r26w

History

Nov 7, 2026 9:45 PM Added references View changes

Type	Values Removed	Values Added
References		https://github.com/babelfish-for-postgresql/babelfish_extensions/security/advisories/GHSA-vq28-vgj3-r26w

Nov 7, 2026 7:30 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Nov 6, 2026 6:45 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		Heap-based Buffer Overflow in Babelfish for PostgreSQL TDS Prelogin Parser
First Time appeared		Amazon Amazon amazon Aurora Postgresql With Babelfish Aws Aws babelfish-for-postgresql
Weaknesses		CWE-122
CPEs		cpe:2.3:a:amazon:amazon_aurora_postgresql_with_babelfish:::::::: cpe:2.3:a:amazon:amazon_aurora_postgresql_with_babelfish:5.5.0:::::::* cpe:2.3:a:aws:babelfish-for-postgresql::::::::
Vendors & Products		Amazon Amazon amazon Aurora Postgresql With Babelfish Aws Aws babelfish-for-postgresql
References		https://aws.amazon.com/security/security-bulletins/2026-166-aws/ 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_6_1_0__PG_18_4
Metrics		cvssV3_1 `{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}` cvssV4_0 `{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}`