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Vulnerability · Published Sep 30, 2026 · Assigned by mitre

CVE-2026-103436

Low 3.7

In plain English

A low-severity security flaw in apcupsd from apcupsd. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.3%top 78.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12apcupsdno fix listedDEBIAN-CVE-2026-103436
Debian:13apcupsdno fix listedDEBIAN-CVE-2026-103436
Debian:14apcupsdno fix listedDEBIAN-CVE-2026-103436
Ubuntu:22.04:LTSapcupsdno fix listedUBUNTU-CVE-2026-103436
Ubuntu:24.04:LTSapcupsdno fix listedUBUNTU-CVE-2026-103436
Ubuntu:26.04:LTSapcupsdno fix listedUBUNTU-CVE-2026-103436
Ubuntu:26.10apcupsdno fix listedUBUNTU-CVE-2026-103436

Affected products (as reported)

VendorProductVersions
apcupsd apcupsd 0 – through 3.14.14

Weakness: CWE-457 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References