nnn 5.2 homelen out-of-bounds write

Summaryinfo

A vulnerability described as problematic has been identified in nnn 5.2. This issue affects some unknown processing. Executing a manipulation of the argument homelen can lead to out-of-bounds write. The identification of this vulnerability is CVE-2026-65610. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability has been found in nnn 5.2 and classified as problematic. This vulnerability affects an unknown code block. The manipulation of the argument homelen with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at cert.pl. This vulnerability was named CVE-2026-65610 since 07/22/2026. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/19/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• nnn

Version

• 5.2

CPE 2.3info

• 🔒

CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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