VulnSocial

CVE-2026-105243

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Insufficient Logging vulnerability in the EventLogAppender of Apache log4net. Long messages were truncated to a fixed size that exceeds what the Windows Event Log accepts once the log and source names are counted, and the event log then stored nothing and reported nothing. A party whose data reaches a log message could suppress the whole record by making it long enough. Only applications on Windows that use EventLogAppender are affected. This issue affects Apache log4net: from 1.2.9 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-778

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • 1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-10-07: 110-07
Referenced assets1 URL
By indicator
Full discourse1 post
  • VulniPulse@vulnipulse

    CVE-2026-105243 | Apache log4net | Medium EventLogAppender can silently lose long log records on Windows. Fixed in 3.5.0. Details and official source: https://vulnipulse.com/advisories/apache-cve-2026-105243

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    6 followersView on X

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