ncopa su-exec up to 0.3 su-exec.c strtol privileges management

Summaryinfo

A vulnerability classified as very critical has been found in ncopa su-exec up to 0.3. This affects the function strtol of the file su-exec.c. The manipulation leads to privileges management. This vulnerability is referenced as CVE-2026-82457. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in ncopa su-exec up to 0.3. It has been rated as very critical. This issue affects the function strtol of the file su-exec.c. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

su-exec through 0.3 fails to validate numeric user and group identifiers parsed with strtol before assigning to uid_t and gid_t, allowing truncation of out-of-range values to zero. Attackers can supply large numeric identifiers that truncate to root's identifier, causing su-exec to execute target programs with root privileges instead of intended unprivileged accounts.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-82457 since 08/29/2026. The exploitation is known to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/29/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• ncopa

Name

• su-exec

Version

• 0.1
• 0.2
• 0.3

Website

• Product: https://github.com/ncopa/su-exec/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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