Medium severity · published Nov 13, 2025
CVE-2025-12818
PostgreSQL libpq undersizes allocations, via integer wraparound
5.9
CVSS
0.4%
EPSS
No
On KEV
Description
Integer wraparound in multiple PostgreSQL libpq client library functions allows an application input provider or network peer to cause libpq to undersize an allocation and write out-of-bounds by hundreds of megabytes. This results in a segmentation fault for the application using libpq. Versions before PostgreSQL 18.1, 17.7, 16.11, 15.15, 14.20, and 13.23 are affected.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
PostgreSQL · PostgreSQL
18 before 18.1; 17 before 17.7; 16 before 16.11; 15 before 15.15; 14 before 14.20; before 13.23 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-12818
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-12818
www.postgresql.org
https://www.postgresql.org/support/security/CVE-2025-12818/
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