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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
apcupsd apcupsd unknown
Version Status Constraints
0 affected ≤ 3.14.14

No data.

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Project Subscriptions

Vendors Products
Apcupsd Subscribe
Apcupsd Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://bugzilla.redhat.com/show_bug.cgi?id=2493140 cve-icon cve-icon
https://github.com/therealbstern/apcupsd/blob/224d19d5faa508d04267f6135fe53d50800550de/src/cgi/upsfetch.c#L240 cve-icon cve-icon
https://sourceforge.net/projects/apcupsd/ cve-icon cve-icon
History

Wed, 30 Sep 2026 16:00:00 +0000

Type Values Removed Values Added
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.
First Time appeared Apcupsd
Apcupsd apcupsd
Weaknesses CWE-457
CPEs cpe:2.3:a:apcupsd:apcupsd:*:*:*:*:*:*:*:*
Vendors & Products Apcupsd
Apcupsd apcupsd
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-09-30T15:38:48.231Z

Reserved: 2026-09-30T15:38:47.884Z

Link: CVE-2026-103436

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-30T16:17:09.700

Modified: 2026-09-30T17:32:07.107

Link: CVE-2026-103436

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses