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TI-2026-65688 Aliases CVE-2026-103436GHSA-8jv2-xm7v-55rg

apcupsd through 3.14.14 discloses uninitialized stack memory in getupsvar() in…

Priority LOW 17CWE-457Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-457 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00293 21st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
apcupsdapcupsdup to 3.14.14—No fix listedCNA
  • apcupsd Vendorapcupsd Affected up to 3.14.14 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-103436
  2. 2026-10-03 Alias added: GHSA-8jv2-xm7v-55rg
  3. 2026-10-06 Affected versions changed · Red Hat
  4. 2026-10-06 CVSS score added · Red Hat

References

Other 3

  • TI-2003-00093 Unknown vulnerability in apcupsd before 3.8.6, and 3.10.x before 3.10.5, allows remote… CVSS 2.0HIGH 10.0
  • TI-2019-09397 Apcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an… CVSS 3.0CRITICAL 9.8
  • TI-2026-65687 Stack-based buffer overflow in apcupsd CVSS 3.1HIGH 8.1
  • TI-2017-05495 In Adam Kropelin adk0212 APC UPS Daemon through 3.14.14, the default installation of… CVSS 3.0HIGH 8.4
  • TI-2019-09396 Apcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an… CVSS 3.0MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences