VulnSocial

CVE-2026-105240

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

Improper Neutralization of Null Byte or NUL Character vulnerability in the OutputDebugStringAppender of Apache log4net. A NUL character in logged content ended the debug output record at that point, so everything the layout rendered after it, including exception text and trailing fields, was silently lost. A party whose data reaches a log message could hide the rest of that record. Only applications on Windows that use OutputDebugStringAppender 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-158

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-2026-105240 | Apache log4net | Medium NUL characters can truncate OutputDebugStringAppender records on Windows. Fixed in 3.5.0. Details and official source: https://vulnipulse.com/advisories/apache-cve-2026-105240

    0000025
    6 followersView on X

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