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CVE-2026-82457— su-exec through 0.3 Privilege Escalation via Numeric User ID

Quick assessment

Affected
ncopa su-exec
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.

su-exec 0.3 及更早版本在使用 解析数值型用户和组标识符时，未对其有效性进行充分校验。若输入的数值超出 和 的表示范围，溢出部分会被截断，导致值变为 0（即 root 的标识符）。攻击者可借此提供足够大的数值标识符，使其截断后等于 root 的 uid/gid（均为 0），从而使 su-exec 以 root 权限执行目标程序，而非预期的非特权账户。

CVSS 7.8 · High

Possible ATT&CK Techniques 1 AI

T1548 · Abuse Elevation Control Mechanism
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I. Basic Information for CVE-2026-82457

Vulnerability Information
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Vulnerability Title
su-exec through 0.3 Privilege Escalation via Numeric User ID
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数值类型间的不正确转换
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ncopa su-exec 0 ~ 0.3 -

II. Public POCs for CVE-2026-82457

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-82457

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Exploits & Public PoCs for CVE-2026-82457 (1)

Proof of Concept for CVE-2026-82457 (1)

Other References for CVE-2026-82457 (1)

IV. Related Vulnerabilities

Same weakness: CWE-681

V. Comments for CVE-2026-82457

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