CVE-2026-78183

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/bucardo/dbdpg/commit/6d6f47ed2403cda55c82b1bad56e388ba7390065.patch
https://github.com/bucardo/dbdpg/commit/adacf1de872326a465e13f9e4281a674ebcd227e
https://github.com/bucardo/dbdpg/security/advisories/GHSA-785p-fw3v-r822
https://metacpan.org/release/TURNSTEP/DBD-Pg-3.21.1/source/Changes
http://www.openwall.com/lists/oss-security/2026/08/23/5

Configurations

No configuration.

History

14 Oct 2026, 13:10

Type	Values Removed	Values Added
Summary		(es) DBD::Pg versión 3.21.0 para Perl tiene una escritura fuera de límites en el heap en quote_float. quote_float() asigna la longitud de la cadena + 1, que es el tamaño del símbolo numérico simple más NULL. Pero para los literales especiales NaN, Inf, +Inf, -Inf, Infinity, +Infinity, -Infinity, emite el literal rodeado de comillas más NULL, lo que es longitud + 3 bytes. Cada literal reconocido (sin distinción entre mayúsculas y minúsculas) desborda por 2 bytes, una comilla simple y un NULL. Esto puede ser alcanzado mediante el método $dbh -> quote, por ejemplo $dbh -> quote( 'Infinity', DBI::SQL_NUMERIC ). Esta regresión fue introducida en la versión 3.21.0 por la reescritura de quote.c.

Information

Published : 2026-08-23 20:16

Updated : 2026-10-14 13:10

NVD link : CVE-2026-78183

Mitre link : CVE-2026-78183

CVE.ORG link : CVE-2026-78183

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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