Vulnerability · Published Aug 23, 2026 · Assigned by CPANSec
CVE-2026-78183DBD::Pg version 3.21.0 for Perl has a heap out-of-bounds write in quote_float
Critical 9.8
In plain English
A critical-severity out-of-bounds write in DBD-Pg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | libdbd-pg-perl | no fix listed | UBUNTU-CVE-2026-78183 |
| Ubuntu:24.04:LTS | libdbd-pg-perl | no fix listed | UBUNTU-CVE-2026-78183 |
| Ubuntu:26.04:LTS | libdbd-pg-perl | no fix listed | UBUNTU-CVE-2026-78183 |
| Ubuntu:26.10 | libdbd-pg-perl | no fix listed | UBUNTU-CVE-2026-78183 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| DBD-Pg | 3.21.0 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/bucardo/dbdpg/security/advisories/GHSA-785p-fw3v-r822 vendor-advisory
- https://metacpan.org/release/TURNSTEP/DBD-Pg-3.21.1/source/Changes release-notes
- https://github.com/bucardo/dbdpg/commit/6d6f47ed2403cda55c82b1bad56e388ba7390065.patch patch
- https://github.com/bucardo/dbdpg/commit/adacf1de872326a465e13f9e4281a674ebcd227e related
- http://www.openwall.com/lists/oss-security/2026/08/23/5