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CVE-2026-11623— tmux image.c image_free use after free

Quick assessment

Affected
n/a tmux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tmux是tmux开源的一款开源的终端多路复用器。 tmux 3.6a及之前版本存在缓冲区错误漏洞，该漏洞源于image.c中的image_free函数存在释放后重用，可能导致本地攻击。

CVSS 4.5 · Medium EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
n/a tmux 3.6a affected
3.7-rc unaffected
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I. Basic Information for CVE-2026-11623

Vulnerability Information
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Vulnerability Title
tmux image.c image_free use after free
Source: CVE Program / CVE List V5
Vulnerability Description
A security vulnerability has been detected in tmux up to 3.6a. Affected is the function image_free of the file image.c. Such manipulation leads to use after free. Local access is required to approach this attack. This attack is characterized by high complexity. The exploitability is told to be difficult. The exploit has been disclosed publicly and may be used. Upgrading to version 3.7-rc is able to address this issue. The name of the patch is fc6d94a9f8a593bd8b7031650802084385d4ee03. The affected component should be upgraded.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
tmux 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tmux是tmux开源的一款开源的终端多路复用器。 tmux 3.6a及之前版本存在缓冲区错误漏洞，该漏洞源于image.c中的image_free函数存在释放后重用，可能导致本地攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- tmux 3.6a cpe:2.3:a:tmux:tmux:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-11623

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III. Intelligence Information for CVE-2026-11623

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Patches & Fixes for CVE-2026-11623 (2)

Proof of Concept for CVE-2026-11623 (1)

Same Patch Batch · n/a · 2026-06-09 · 64 CVEs total

CVE-2026-11572 8.8 HIGH degit 操作系统命令注入漏洞
CVE-2026-11621 4.7 MEDIUM Dcat-Admin User Setting upload editorMDUpload unrestricted upload
CVE-2025-52293 GPAC MP4Box 资源管理错误漏洞
CVE-2026-36811 Tenda W15E 安全漏洞
CVE-2025-52292 GPAC MP4Box 安全漏洞
CVE-2026-30141 AnimatedGIF 安全漏洞
CVE-2026-36726 bookcars 安全漏洞
CVE-2026-36724 FastApiAdmin 资源管理错误漏洞
CVE-2026-36818 Tenda W20E 安全漏洞
CVE-2026-36793 Tenda W3 安全漏洞
CVE-2026-36778 Tenda O3 安全漏洞
CVE-2026-36822 Tenda W20E 安全漏洞
CVE-2026-36783 Tenda O3 Wireless Router 安全漏洞
CVE-2026-36792 Tenda W3 安全漏洞
CVE-2026-36816 Tenda W15E 安全漏洞
CVE-2026-36723 bookcars 安全漏洞
CVE-2026-36725 FastApiAdmin 跨站脚本漏洞
CVE-2026-36791 Tenda O3 安全漏洞
CVE-2026-36801 Tenda G0 安全漏洞
CVE-2025-55659 GPAC MP4Box 代码问题漏洞

Showing top 20 of 64 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: tmux
Same vendor: n/a
Same weakness: CWE-416

V. Comments for CVE-2026-11623

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