CVE-2023-31136

Name: CVE-2023-31136
Creator: NVD / NIST
Published: 2023-05-09T14:15:13.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2023-31136 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. PostgresNIO is a Swift client for PostgreSQL. Any user of PostgresNIO prior to version 1.14.2 connecting to servers with TLS enabled is vulnerable to a man-in-the-middle attacker injecting false responses to the client's first few queries, despite the use of TLS certificate verification and encryption. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

PostgresNIO is a Swift client for PostgreSQL. Any user of PostgresNIO prior to version 1.14.2 connecting to servers with TLS enabled is vulnerable to a man-in-the-middle attacker injecting false responses to the client's first few queries, despite the use of TLS certificate verification and encryption. The vulnerability is addressed in PostgresNIO versions starting from 1.14.2. There are no known workarounds for unpatched users.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

0.49%

38.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Vapor	Postgresnio	< 1.14.2

References

https://github.com/advisories/GHSA-467w-rrqc-395fNot Applicable
https://github.com/advisories/GHSA-735f-7qx4-jqq5Not Applicable
https://github.com/apple/swift-nio/pull/2419Patch
https://github.com/vapor/postgres-nio/commit/2df54bc94607f44584ae6ffa74e3cd754fffafc7Patch
https://github.com/vapor/postgres-nio/releases/tag/1.14.2Release Notes
https://github.com/vapor/postgres-nio/security/advisories/GHSA-9cfh-vx93-84vvVendor Advisory
https://www.postgresql.org/support/security/CVE-2021-23214/Not Applicable
https://www.postgresql.org/support/security/CVE-2021-23222/Not Applicable
https://github.com/advisories/GHSA-467w-rrqc-395fNot Applicable
https://github.com/advisories/GHSA-735f-7qx4-jqq5Not Applicable
https://github.com/apple/swift-nio/pull/2419Patch
https://github.com/vapor/postgres-nio/commit/2df54bc94607f44584ae6ffa74e3cd754fffafc7Patch
https://github.com/vapor/postgres-nio/releases/tag/1.14.2Release Notes
https://github.com/vapor/postgres-nio/security/advisories/GHSA-9cfh-vx93-84vvVendor Advisory
https://www.postgresql.org/support/security/CVE-2021-23214/Not Applicable
https://www.postgresql.org/support/security/CVE-2021-23222/Not Applicable

Timeline

Published: May 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-31136?

How severe is CVE-2023-31136?

CVE-2023-31136 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2023-31136?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-31136?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST