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CVE-2026-65610— Numeric Truncation Error 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版本存在数字错误漏洞，该漏洞源于将homelen变量存储为uchar_t类型，导致其值范围限制在0-255，攻击者可通过影响执行环境提供任意HOME路径长度截断为0，进而造成路径缓冲区前一个字节的越界读取和越界写入。

CVSS 2.4 · Low EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
nnn nnn 5.2 affected
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I. Basic Information for CVE-2026-65610

Vulnerability Information
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Vulnerability Title
Numeric Truncation Error in nnn
Source: CVE Program / CVE List V5
Vulnerability Description
nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer.  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:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值截断错误
Source: CVE Program / CVE List V5
Vulnerability Title
Arun Prakash Jana nnn 数字错误漏洞
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版本存在数字错误漏洞，该漏洞源于将homelen变量存储为uchar_t类型，导致其值范围限制在0-255，攻击者可通过影响执行环境提供任意HOME路径长度截断为0，进而造成路径缓冲区前一个字节的越界读取和越界写入。
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-2026-65610

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III. Intelligence Information for CVE-2026-65610

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Security Blog Posts for CVE-2026-65610 (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-2026-65609 2.4 LOW Out-of-bounds write in nnn

IV. Related Vulnerabilities

Same product: nnn
Same vendor: nnn
Same weakness: CWE-197