CVE-2026-18024Network attack vector

Authenticated memory disclosure via unchecked character length

Published Aug 13, 2026 · Updated Aug 13, 2026

Buffer over-read in PostgreSQL core server before 18.6, 17.11, 16.15, 15.19, and 14.24 allows remote authenticated users to read server memory. The ascii() SQL function trusts the leading byte of invalidly encoded text as the character length without confirming that the allocation contains that many bytes. A valid database login and crafted text value are required; each call can disclose up to three bytes beyond the specific allocation.

CVSS severity4.3
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer over-read in PostgreSQL core server before 18.6, 17.11, 16.15, 15.19, and 14.24 allows remote authenticated users to read server memory. The ascii() SQL function trusts the leading byte of invalidly encoded text as the character length without confirming that the allocation contains that many bytes. A valid database login and crafted text value are required; each call can disclose up to three bytes beyond the specific allocation.

The record

CVE
CVE-2026-18024
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
PostgreSQL Global Development Group
Product
PostgreSQL
Classifications
CWE-126
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <14.24
  2. Affected versionversion=15 <15.19
  3. Affected versionversion=16 <16.15
  4. Affected versionversion=17 <17.11
  5. Affected versionversion=18 <18.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PostgreSQL Global Development Group · PostgreSQLversion=0 <14.24; version=15 <15.19; version=16 <16.15; version=17 <17.11; version=18 <18.5

Published CVSS scores

4.3PostgreSQL Global Development GroupCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo