# ConnectBot SSH Client Library: Unbounded SSH field lengths can cause excessive memory allocation

Advisory record · `GHSA-ch3q-cw5r-f4hg`

- **Identifiers:** `GHSA-ch3q-cw5r-f4hg` · `CVE-2026-54700`
- **State:** Confirmed
- **Severity:** CVSS 6.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-20](https://cwe.mitre.org/data/definitions/20.html) · [CWE-789](https://cwe.mitre.org/data/definitions/789.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md) · [CWE-20](https://agentprime.io/advisories/tag/cwe-20.md)
- **Published:** 12 Jun 2026
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 12 Jun 2026, 21:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.connectbot.sshlib:sshlib` (Maven): affected `<=0.3.0`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> ConnectBot SSH Client Library (org.connectbot.sshlib:sshlib) versions up to and including 0.3.0 are affected. A malicious or compromised SSH server can send a small malformed packet with an inner length or count field far larger than the packet, causing excessive memory allocation or an OutOfMemoryError that can terminate the application; with agent forwarding enabled, the connected server can trigger the same through agent messages. Upgrade to version 0.3.1 or later.

Written 2 Nov 2026.

## 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

- 6.9 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0037, the 31st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:19 UTC: First seen by agentprime
- 31 Oct 2026, 14:19 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-ch3q-cw5r-f4hg)

## Sources

- [GitHub Advisory Database: GHSA-ch3q-cw5r-f4hg](https://github.com/advisories/GHSA-ch3q-cw5r-f4hg)
- [OSV: GHSA-ch3q-cw5r-f4hg](https://osv.dev/vulnerability/GHSA-ch3q-cw5r-f4hg)
- <https://github.com/connectbot/cbssh/security/advisories/GHSA-ch3q-cw5r-f4hg>
- <https://github.com/connectbot/cbssh>
- <https://github.com/connectbot/cbssh/releases/tag/v0.3.1>

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-ch3q-cw5r-f4hg>, 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-ch3q-cw5r-f4hg/>. Everything for agents: <https://agentprime.io/llms.txt>.