# CVE-2026-18852: epsilla-cloud vectordb Filter expr.cpp ShuntingYard unusual condition

> A local attacker can exploit improper condition checks in the filter parser to cause a denial of service in epsilla-cloud vectordb.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Aug 2026
- **Updated:** 5 Aug 2026
- **Also known as:** GHSA-v276-wxc4-7v7p

## What is CVE-2026-18852?

CVE-2026-18852 is a medium-severity vulnerability in epsilla-cloud vectordb, published on 4 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been found in epsilla-cloud vectordb up to 0.3.18/df5a5f5afb85a2376a0f2f316c79dea9b2c6ac7a. This impacts the function SplitTokens/ShuntingYard of the file engine/query/expr/expr.cpp of the component Filter Parser. Such manipulation leads to improper check for unusual conditions. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-754 (Improper Check for Unusual or Exceptional Conditions)

## Which versions are affected by CVE-2026-18852?


## How do I fix CVE-2026-18852?

No fix has been published for CVE-2026-18852 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-18852 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18852 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-18852 and fix it if it is affected.

What it is: CVE-2026-18852 is a medium-severity vulnerability in epsilla-cloud vectordb, published on 4 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18852 exists.

Affected product: epsilla-cloud vectordb. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-18852/ (Markdown: https://insights.sbomify.com/CVE-2026-18852/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-18852
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-18852
- OSV: https://osv.dev/vulnerability/CVE-2026-18852

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-18852/
Summaries are generated and may contain mistakes; the official description above is the record.