---
id: CVE-2026-78183
title: >-
  DBD::Pg version 3.21.0 for Perl has a heap out-of-bounds write in quote_float.


  quote_float() allocates the length of the string + 1, which is the size of the
  bare numeric symbol plus NULL
summary: >-
  DBD::Pg version 3.21.0 for Perl has a heap out-of-bounds write in quote_float.


  quote_float() allocates the length of the string + 1, which is the size of the
  bare numeric symbol plus NULL.  But for special literals NaN, Inf, +Inf,
  -Inf,…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
published: '2026-08-23'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78183'
references:
  - url: >-
      https://github.com/bucardo/dbdpg/commit/6d6f47ed2403cda55c82b1bad56e388ba7390065.patch
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: >-
      https://github.com/bucardo/dbdpg/commit/adacf1de872326a465e13f9e4281a674ebcd227e
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://github.com/bucardo/dbdpg/security/advisories/GHSA-785p-fw3v-r822'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://metacpan.org/release/TURNSTEP/DBD-Pg-3.21.1/source/Changes'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'http://www.openwall.com/lists/oss-security/2026/08/23/5'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00671
epssPercentile: 0.50733
ingestedAt: '2026-10-14T13:30:58.552Z'
---

## Overview

DBD::Pg version 3.21.0 for Perl has a heap out-of-bounds write in quote_float.

quote_float() allocates the length of the string + 1, which is the size of the bare numeric symbol plus NULL.  But for special literals NaN, Inf, +Inf, -Inf, Infinity, +Infinity, -Infinity it emits the literal surrounded by quotes plus NULL, which is length + 3 bytes. Every recognised literal (case-insensitive) overflows by 2 bytes, a single quote and a NULL.

This can be reached by the $dbh->quote method, for example

    $dbh->quote( "Infinity", DBI::SQL_NUMERIC ).

This regression was introduced in 3.21.0 by the quote.c rewrite.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.