Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix. The client overwrites a huge memory region with bytes outside attacker knowledge or control. This typically yields a simple SIGSEGV, but rare cases might achieve client-specific integrity impact via the write. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

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

Vendor Product Default status Versions
n/a PostgreSQL unaffected
Version Status Constraints
18 affected < 18.5
17 affected < 17.11
16 affected < 16.15
15 affected < 15.19
0 affected < 14.24

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.postgresql.org/support/security/CVE-2026-16241/ cve-icon cve-icon
History

Thu, 13 Aug 2026 13:15:00 +0000

Type Values Removed Values Added
Description Integer underflow in PostgreSQL ECPG allows a database server administrator to achieve temporary denial of service against the ECPG client via sending a bytea value lacking the mandatory prefix. The client overwrites a huge memory region with bytes outside attacker knowledge or control. This typically yields a simple SIGSEGV, but rare cases might achieve client-specific integrity impact via the write. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.
Title PostgreSQL ECPG integer underflow can crash the client
Weaknesses CWE-191
References
Metrics cvssV3_1

{'score': 3.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: PostgreSQL

Published:

Updated: 2026-08-13T13:00:13.697Z

Reserved: 2026-07-20T01:55:34.563Z

Link: CVE-2026-16241

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-13T13:17:46.670

Modified: 2026-08-13T13:17:46.670

Link: CVE-2026-16241

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses