CVE-2026-78183 DBD::Pg version 3.21.0 for Perl has a heap out-of-bounds write in quote_float
A heap out-of-bounds write in DBD::Pg allows attackers to cause memory corruption or execute code via crafted numeric inputs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-78183?
CVE-2026-78183 is a critical memory corruption vulnerability in perl-DBD-Pg, published on 23 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2026-78183?
Linux distribution packages (1)
perl-DBD-Pg openSUSE:Tumbleweed | All versions | 3.21.2-1.1 |
How do I fix CVE-2026-78183?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-78183 being exploited?
There is no known exploitation of CVE-2026-78183 in the wild and no public exploit code.
Sources
Also known as GHSA-6mq2-jf7v-pvjx, GHSA-785p-fw3v-r822, UBUNTU-CVE-2026-78183, openSUSE-SU-2026:11722-1.