apcupsd through 3.14.14 has an sscanf stack-based buffer overflow in getupsvar() in src/cgi/upsfetch.c (used by upsstats.cgi, multimon.cgi, and… (CVE-2026-103432)
Description
A stack-based buffer overflow vulnerability exists in apcupsd through version 3.14.14 in the getupsvar() function within src/cgi/upsfetch.c. This function is used by CGI scripts such as upsstats.cgi, multimon.cgi, and upsfstats.cgi. The vulnerability is related to CVE-2026-15544 and could allow an attacker to cause a denial of service or potentially execute arbitrary code.
CVSS v3.1
Score 8.1high
Affected software
pkg:deb/ubuntu/apcupsd?arch=source&distro=xenialpkg:deb/ubuntu/apcupsd?arch=source&distro=bionicpkg:deb/ubuntu/apcupsd?arch=source&distro=focalpkg:deb/ubuntu/apcupsd?arch=source&distro=jammypkg:deb/ubuntu/apcupsd?arch=source&distro=noblepkg:deb/ubuntu/apcupsd?arch=source&distro=stonkingpkg:deb/ubuntu/apcupsd?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in apcupsd versions up to 3.14.14 is a stack-based buffer overflow caused by improper use of sscanf in the getupsvar() function located in src/cgi/upsfetch.c. This function is utilized by several CGI scripts including upsstats.cgi, multimon.cgi, and upsfstats.cgi. The flaw allows an attacker to overflow a buffer on the stack, which could lead to code execution or service disruption. This issue is related to another vulnerability identified as CVE-2026-15544.
Potential Impact
Successful exploitation of this vulnerability could result in high impact including complete confidentiality, integrity, and availability compromise of the affected system. The CVSS score of 8.1 reflects the potential for remote exploitation without privileges or user interaction, though the attack complexity is high.
Mitigation Recommendations
No explicit patch or remediation information is provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid exposing the vulnerable CGI scripts to untrusted networks and consider disabling or restricting access to upsstats.cgi, multimon.cgi, and upsfstats.cgi if possible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-103432
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6ad3f4f62cdf04f656657603
Added to database: 10/17/2026, 22:21:42 UTC
Last enriched: 10/17/2026, 22:43:15 UTC
Last updated: 10/17/2026, 22:43:15 UTC
Views: 2
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