CVE-2026-65610

What it is

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.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account, but needs a user to act. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-08-19 14:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-27 12:10 UTC Last updatedMost recent change to the record

Details

Published

2026-08-19 14:17 UTC

Last modified

2026-10-27 12:10 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-197

Record status

Deferred

Attack profile CVSS 4.0 · 2.4

Attack vector

Local

Complexity

Low

Attack requirements

None

Privileges needed

Low

User interaction

Active

Confidentiality

Low

Integrity

Low

Availability

Low