JLSEC-2026-528 High 7.8

JLSEC-2026-528

JLSEC Published: May 26, 2026
Modified: Jul 23, 2026
Severity: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Packages: tmux_jll < 3.3.0+0
Upstream: CVE-2020-27347

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.

References

https://github.com/tmux/tmux/commit/a868bacb46e3c900530bed47a1c6f85b0fbe701c
https://raw.githubusercontent.com/tmux/tmux/3.1c/CHANGES
https://security.gentoo.org/glsa/202011-10
https://www.openwall.com/lists/oss-security/2020/11/05/3