# CVE-2020-27347: tmux: In tmux before version 3.1c the function input_csi_dispatch_sgr_colon() in file input.c contained a stack-based buffe...

CVE-2020-27347 is fixed in tmux on 1 platform by tmux 3.0a-2ubuntu0.2 (version 3.0a-2ubuntu0.2), released November 3, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-27347
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0069
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 3, 2020

## Description

In tmux before version 3.1c the function input_csi_dispatch_sgr_colon() in file input.c contained a stack-based buffer-overflow that can be exploited by terminal output.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tmux Ubuntu 20.04 LTS (focal) | 3.0a-2ubuntu0.2 | [tmux 3.0a-2ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tmux-3.0a-2ubuntu0.2.md) | Nov 3, 2020 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.