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PostgreSQL pltcl/plperl EUVDEUVD-2026-57841

| CVE-2026-14677 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-08-13 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 GHSA-m27x-8754-w5v9
RCE PostgreSQL Integer Overflow
8.8
CVSS 3.1 · Vendor: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
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Severity by source

Vendor (f86ef6dc-4d3a-42ad-8f28-e6d5547a5007) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

AC:H because exploitation requires a 32-bit PostgreSQL build, a target-environment condition beyond attacker control; all other metrics align with provided vector.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
8.8 HIGH
qualitative

Primary rating from Vendor (f86ef6dc-4d3a-42ad-8f28-e6d5547a5007).

CVSS VectorVendor: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

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

Lifecycle Timeline

3
Patch available
Aug 13, 2026 - 14:02 EUVD
Analysis Generated
Aug 13, 2026 - 13:36 vuln.today
CVE Published
Aug 13, 2026 - 13:17 cve.org
HIGH 8.8

DescriptionCVE.org

Integer wraparound in PostgreSQL 32-bit builds of pltcl and plperl allows an object creator to cause the server to undersize an allocation and write out-of-bounds via crafted function bodies. This may execute arbitrary code as the operating system user running the database. CVE-2026-6473 had fixed similar problems. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

Articles & Coverage 2

News 18 New PostgreSQL Vulnerabilities - 18 High Severity, No POC Available Aug 14, 2026 News 18 New PostgreSQL Vulnerabilities - 18 High Severity, No POC Available Aug 13, 2026

AnalysisAI

Integer wraparound in 32-bit builds of PostgreSQL's PL/Tcl and PL/Perl procedural language extensions enables an authenticated object creator to provoke an undersized heap allocation and perform an out-of-bounds write via a crafted function body, ultimately achieving arbitrary code execution as the OS user running the database process. PostgreSQL versions before 18.5, 17.11, 16.15, 15.19, and 14.24 across active major release branches are affected. This is a recurrence of the class of integer arithmetic flaws previously addressed by CVE-2026-6473, indicating an incomplete prior remediation; no public exploit or CISA KEV listing has been identified at time of analysis.

Technical ContextAI

The vulnerability class is CWE-190 (Integer Overflow or Wraparound), occurring specifically within the C-level glue code of PostgreSQL's embedded Tcl (pltcl) and Perl (plperl) procedural language handlers on 32-bit architecture builds. On 32-bit systems, size_t and related integer types are 32 bits wide, making wrap-around from large input values arithmetically possible at different thresholds than on 64-bit builds. An attacker supplies a crafted function body that causes an arithmetic wrap-around when computing an allocation size, resulting in a smaller-than-required buffer being allocated. Subsequent writes then exceed the buffer boundary - a classic heap out-of-bounds write primitive (CWE-787 is the secondary consequence). The root cause mirrors CVE-2026-6473, which patched analogous integer arithmetic issues in PostgreSQL's procedural language infrastructure, but this CVE indicates at least one code path was not captured by that fix. Affected CPEs span all actively supported PostgreSQL major versions (14 through 18) on 32-bit platforms.

RemediationAI

The primary remediation is upgrading to a patched PostgreSQL release: version 14.24, 15.19, 16.15, 17.11, or 18.5, as appropriate for the installed major version. These versions contain the fix for the integer wraparound in pltcl and plperl. Upgrade instructions and packages are available via the official PostgreSQL security advisory at https://www.postgresql.org/support/security/CVE-2026-14677/. As a compensating control where immediate patching is not feasible, database administrators can revoke CREATE FUNCTION privileges from untrusted database users and remove or disable the pltcl and plperl extensions (using DROP EXTENSION pltcl and DROP EXTENSION plperl) in databases where they are not operationally required - note this will break any existing PL/Tcl or PL/Perl functions. Restricting the CREATE privilege also limits the broader attack surface for privilege-escalation vectors in PostgreSQL. Migrating 32-bit PostgreSQL deployments to 64-bit builds eliminates this specific vulnerability class entirely.

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Same weakness CWE-190 – Integer Overflow or Wraparound

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected

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EUVD-2026-57841 vulnerability details – vuln.today
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