8.1

CVE-2026-103432: apcupsd Stack-based Buffer Overflow

CVSS: 8.1v3.1HighDeferred
AliasesUBUNTU-CVE-2026-103432DEBIAN-CVE-2026-103432
Published 30-09-2026Last modified 30-09-2026
Open JSON

Vulnerability summary

CVE-2026-103432 is a high (CVSS 8.1) Stack-based Buffer Overflow vulnerability in apcupsd. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.5% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.38%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

Description

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 upsfstats.cgi), a related issue to CVE-2026-15544.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

01-10-202620-10-2026
EPSS score
0.38%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apcupsd1 product
Debian1 product
  • apcupsdAll versions (No fix recorded)
Ubuntu1 product
  • apcupsdAll versions (No fix recorded)

3 vendors · 3 products

References

6 links