CVE-2025-12818 | PostgreSQL libpq undersizes allocations, via integer wraparound

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.

Published: 2025-11-13 Last update: 2026-04-15 Assigner: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 Source: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-12818 is rated Low Risk (29.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-12818

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-09 0.04% 0.05% +0.01%
2 2026-04-11 0.05% 0.04% -0.01%
3 2025-11-19 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-12818

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 3.6 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

Weakness enumeration for CVE-2025-12818

OS Trackers for CVE-2025-12818

vendor priority summary link
alpine medium CVE-2025-12818: 5 source package rows (postgresql, postgresql15, postgresql16, postgresql17, postgresql18); 33 state rows across 9 repos (3.19-main, 3.20-main, 3.21-main, 3.22-community, 3.22-main, 3.23-community, 3.23-main, edge-community, edge-main); fixed 15, open 18. https://security.alpinelinux.org/vuln/CVE-2025-12818
debian not yet assigned CVE-2025-12818 not yet assigned priority: Debian including 4 source packages (postgresql-13, postgresql-15, postgresql-17, postgresql-18), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-12818
redhat medium — https://access.redhat.com/security/cve/CVE-2025-12818
suse high CVE-2025-12818 severity important: SUSE including 788 source package names (0.6.41-13.9:libpq5-18.1-150600.13.3.1, 2.13.2_git56172457-4.12:libpq5-18.1-150600.13.3.1, …), 2516 product×package rows across 108 product lines (Container containers/open-webui, Container private-registry/harbor-db, … (108 product lines)): Fixed 1885, Known Not Affected 323, Known Affected 231, First Fixed 77. https://www.suse.com/security/cve/CVE-2025-12818/
ubuntu medium CVE-2025-12818 medium priority: Ubuntu including 8 source packages (postgresql-10, postgresql-12, …), 44 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): DNE 28, released 8, ignored 4, needs-triage 3, deferred 1. https://ubuntu.com/security/CVE-2025-12818

Affected software / configurations for CVE-2025-12818

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-12818

cvelogic Threat Intelligence