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CVE-2026-103436

Quick assessment

Affected
apcupsd apcupsd
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.

apcupsd 3.14.14 及更早版本在 中的 函数存在未初始化栈内存泄露漏洞。该函数被 、 和 使用。在单字段处理路径中，如果匹配的 STATUS 行包含的空白分隔令牌少于三个， 不会执行任何赋值操作，但函数仍返回成功状态。因此，调用者会将未初始化的目标缓冲区内容输出到 HTTP 响应中，导致敏感信息泄露。

CVSS 3.7 · Low EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
apcupsd apcupsd ≤ 3.14.14 affected
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I. Basic Information for CVE-2026-103436

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
apcupsd through 3.14.14 discloses uninitialized stack memory in getupsvar() in src/cgi/upsfetch.c (used by upsstats.cgi, multimon.cgi, and upsfstats.cgi. On the single-field path, when the matched STATUS line has fewer than three whitespace-separated tokens, sscanf("%*s %*s %s", answer) performs no assignment but the function returns success, and thus the caller prints the uninitialized destination buffer into the HTTP response.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用未经初始化的变量
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
apcupsd apcupsd 0 ~ 3.14.14 -

II. Public POCs for CVE-2026-103436

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-103436

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Vendor Advisories for CVE-2026-103436 (1)

Other References for CVE-2026-103436 (1)

IV. Related Vulnerabilities

Same product: apcupsd
Same vendor: apcupsd
Same weakness: CWE-457

V. Comments for CVE-2026-103436

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