Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-65609— Out-of-bounds write in nnn

Quick assessment

Affected
nnn nnn
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.

Arun Prakash Jana nnn是Arun Prakash Jana个人开发者开源的一个用 C 语言编写的便携式终端文件管理器。 Arun Prakash Jana nnn 5.2版本存在缓冲区错误漏洞，该漏洞源于缺少对从会话文件反序列化的攻击者控制长度字段的验证，可能导致越界写入并破坏相邻全局状态。

CVSS 2.4 · Low EPSS 0.11% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
nnn nnn 5.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-65609

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Out-of-bounds write in nnn
Source: CVE Program / CVE List V5
Vulnerability Description
nnn is vulnerable to Out-of-Bound write vulnerability. Due to lack of validation of attacker-controlled length fields deserialized from a session file, a crafted session file can cause nnn to write data beyond the bounds of fixed-size global buffers when loaded with the -s option. An attacker who can place a malicious session file in the victim's nnn session directory can exploit this to corrupt adjacent global state. Maintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Arun Prakash Jana nnn 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Arun Prakash Jana nnn是Arun Prakash Jana个人开发者开源的一个用 C 语言编写的便携式终端文件管理器。 Arun Prakash Jana nnn 5.2版本存在缓冲区错误漏洞，该漏洞源于缺少对从会话文件反序列化的攻击者控制长度字段的验证，可能导致越界写入并破坏相邻全局状态。
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
nnn nnn 5.2 -

II. Public POCs for CVE-2026-65609

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-65609

请登录查看更多情报信息。

Security Blog Posts for CVE-2026-65609 (1)

Same Patch Batch · nnn · 2026-08-19 · 4 CVEs total

CVE-2026-65612 5.1 MEDIUM Shell Command Injection in nnn
CVE-2026-65611 5.1 MEDIUM Shell Command Injection in nnn
CVE-2026-65610 2.4 LOW Numeric Truncation Error in nnn

IV. Related Vulnerabilities

Same product: nnn
Same vendor: nnn
Same weakness: CWE-787

V. Comments for CVE-2026-65609

No comments yet

Leave a comment