Use of Uninitialized Variable Affecting apcupsd package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published1 Oct 2026
- disclosed30 Sept 2026
Introduced: 30 Sep 2026
NewCVE-2026-103436 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest apcupsd.
NVD Description
Note: Versions mentioned in the description apply only to the upstream apcupsd package and not the apcupsd package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.