# CVE-2026-86734: Snipe-IT before 8.7.1 Denial of Service via Unbounded Note Field

> Authenticated users can cause denial of service by submitting large note fields that exhaust CPU resources during markdown rendering.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-4vcv-fc5x-jjwv, GHSA-pqpw-8v7c-2fw4

## What is CVE-2026-86734?

CVE-2026-86734 is a high-severity denial of service vulnerability in Snipeitapp Snipe-It, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Snipe-IT before 8.7.1 fails to validate the length of the note field in the POST /account/accept/{acceptance} endpoint, allowing authenticated users to submit unbounded input that reaches synchronous CommonMark rendering. Attackers can submit large note values to exhaust PHP worker CPU and cause denial of service through resource exhaustion in the markdown parsing pipeline.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-86734?

It affects 1 product.


Products: Snipeitapp Snipe-It.

## How do I fix CVE-2026-86734?

No fix has been published for CVE-2026-86734 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86734 being exploited?

There is no known exploitation of CVE-2026-86734 in the wild and no public exploit code.

## Other vulnerabilities in Snipeitapp Snipe-It

- [CVE-2025-63601](https://insights.sbomify.com/CVE-2025-63601/): File upload in n/a (critical 9.9)
- [CVE-2026-37709](https://insights.sbomify.com/CVE-2026-37709/): Snipe-IT has insecure permissions in file uploads (critical 9.8)
- [CVE-2026-86738](https://insights.sbomify.com/CVE-2026-86738/): Snipe-IT before 8.7.0 CSS Injection via Custom CSS (critical 9.3)
- [CVE-2026-116199](https://insights.sbomify.com/CVE-2026-116199/): Snipe-IT before 8.6.3 Authentication Bypass via Google SSO Callback (critical 9.2)
- [CVE-2022-1380](https://insights.sbomify.com/CVE-2022-1380/): Stored Cross Site Scripting vulnerability in Item name parameter in snipe/snipe-it (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86734 and fix it if it is affected.

What it is: CVE-2026-86734 is a high-severity denial of service vulnerability in Snipeitapp Snipe-It, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-86734 in the wild and no public exploit code.

Affected product: Snipeitapp Snipe-It. 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-2026-86734/ (Markdown: https://insights.sbomify.com/CVE-2026-86734/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86734
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86734
- OSV: https://osv.dev/vulnerability/CVE-2026-86734

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86734/
Summaries are generated and may contain mistakes; the official description above is the record.