Low severity · published Aug 13, 2026
CVE-2026-16241
PostgreSQL ECPG integer underflow can crash the client
3.8
CVSS
0.3%
EPSS
No
On KEV
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 18.6, 17.11, 16.15, 15.19, and 14.24 are affected.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PO
PostgreSQL · PostgreSQL
18 before 18.6; 17 before 17.11; 16 before 16.15; 15 before 15.19; before 14.24 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-16241
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-16241
Vendor Advisory
https://www.postgresql.org/support/security/CVE-2026-16241/
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