---
cve: "CVE-2026-78183"
severity: "CRITICAL"
cvss: 9.8
epss: "0.7%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-08-23 20:16:50"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-11-11T02:18:37+01:00"
---

# CVE-2026-78183

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **CPANSec**
- State: PUBLISHED
- Stand: 2026-08-25 19:32:39

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-787** — Out-of-bounds Write
  The product writes data past the end, or before the beginning, of the intended buffer.

## Patch verfügbar (OSV)

- 6d6f47ed2403cda55c82b1bad56e388ba7390065 (Commit)
- adacf1de872326a465e13f9e4281a674ebcd227e (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-78183/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_