---
cve: "CVE-2026-78691"
severity: "LOW"
cvss: 2.1
epss: "4.4%"
vendor: "ash-project"
kev: false
exploited: false
published: "2026-08-30 12:17:18"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-08-31T16:38:38+02:00"
---

# CVE-2026-78691

> 2.1 LOW · 🧪 PoC

## Beschreibung

Improper Neutralization of Special Elements in Data Query Logic vulnerability in ash-project ash_sql allows a user who supplies a search term to contains/2, string_starts_with/2, or string_ends_with/2 to inject live SQL LIKE wildcards, turning a literal substring search into an attacker-controlled pattern match.

The escape helpers in AshSql.Expr prefix % and _ with a backslash but never escape a backslash already present in the input. Because backslash is the default LIKE escape character, the escaping defeats itself: the input \% becomes the pattern fragment \\%, where \\ is a literal backslash and the attacker's % remains a live wildcard. The search value stays parameterized, so this is confined to the LIKE pattern grammar rather than full SQL. An attacker can widen matches to probe values, slip past a negated contains(...) guard, or crash the query with a trailing lone backslash.

This issue affects ash_sql: from 0.1.1-rc.10 before 0.7.1.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- cfe94c67484270db0f46384bd35cf1fbad8793d5 (Commit)

## Referenzen

- <https://github.com/ash-project/ash_sql/security/advisories/GHSA-5jgp-7mhc-6qqh>
- <https://cna.erlef.org/cves/CVE-2026-78691.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-78691>
- <https://github.com/ash-project/ash_sql/commit/d95c55c64b1b42cc2fd30211a4913f3145156cd4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-78691) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_