PostgreSQL ECPG integer underflow can crash the client

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-16241
StatePUBLISHED
AssignerPostgreSQL
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 13:17:46 UTC
Updated2026-08-19 15:00:20 UTC
DescriptionInteger 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.

Risk And Classification

Primary CVSS: v3.1 3.8 LOW from f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

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

EPSS: 0.003350000 probability, percentile 0.264560000 (date 2026-08-18)

Problem Types: CWE-191 | CWE-191 Integer Underflow (Wrap or Wraparound)

VersionSourceTypeScoreSeverityVector
3.1f86ef6dc-4d3a-42ad-8f28-e6d5547a5007Secondary3.8LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L
3.1CNACVSS3.8LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Postgresql Postgresql All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na PostgreSQL affected 18 18.5 rpm Not specified
CNA Na PostgreSQL affected 17 17.11 rpm Not specified
CNA Na PostgreSQL affected 16 16.15 rpm Not specified
CNA Na PostgreSQL affected 15 15.19 rpm Not specified
CNA Na PostgreSQL affected 14.24 rpm Not specified

References

ReferenceSourceLinkTags
www.postgresql.org/support/security/CVE-2026-16241 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 www.postgresql.org Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: The PostgreSQL project thanks ylwangtju for reporting this problem. (en)

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