# unpoly-rails Denial of Service vulnerability

Advisory record · `GHSA-m875-3xf6-mf78`

- **Identifiers:** `GHSA-m875-3xf6-mf78` · `CVE-2023-28846`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 30 Mar 2023
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 30 Mar 2023, 22:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `unpoly-rails` (RubyGems): affected `<2.7.2.2`; fixed in `2.7.2.2`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.010, the 63rd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:16 UTC: First seen by agentprime
- 31 Oct 2026, 15:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-m875-3xf6-mf78)

## Sources

- [GitHub Advisory Database: GHSA-m875-3xf6-mf78](https://github.com/advisories/GHSA-m875-3xf6-mf78)
- [OSV: GHSA-m875-3xf6-mf78](https://osv.dev/vulnerability/GHSA-m875-3xf6-mf78)
- <https://github.com/unpoly/unpoly-rails/security/advisories/GHSA-m875-3xf6-mf78>
- <https://nvd.nist.gov/vuln/detail/CVE-2023-28846>
- <https://github.com/unpoly/unpoly-rails/commit/cd9ad0007daceeb3b2354fdcab4f88350427bf16>
- <https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#passive-health-checks>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/unpoly-rails/CVE-2023-28846.yml>
- <https://github.com/unpoly/unpoly-rails>
- <https://makandracards.com/operations/537537-nginx-proxy-buffer-tuning>
- <https://tryhexadecimal.com/guides/http/414-request-uri-too-long>
- <https://unpoly.com/up.protocol>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-m875-3xf6-mf78>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-m875-3xf6-mf78/>. Everything for agents: <https://agentprime.io/llms.txt>.