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  4. CVE 2026 105244 apache log4net remotesyslogappender silently
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-105244

Apache log4net: RemoteSyslogAppender silently deletes non-ASCII contentCVE-2026-105244

Answer in brief

CVE-2026-105244 records a Medium severity (CVSS 5.3) vulnerability in Apache log4net: RemoteSyslogAppender silently deletes non-ASCII content. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/log4net (generic), Apache Software Foundation/log4net (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 6, 2026Updated Oct 6, 2026Source checked Oct 7, 2026First seen by HOL Oct 6, 2026Material review Oct 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/log4net (generic), Apache Software Foundation/log4net (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/log4netgeneric>=1.2.12 <3.5.03.5.0
Apache Software Foundation/log4netgeneric>=56a2e146e21ff4737e1ff3ec308810e667873947 <77717061b20d4346b6c0ce6b54643d85fb348bc777717061b20d4346b6c0ce6b54643d85fb348bc7

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/log4net, Apache Software Foundation/log4net.
  2. 2Review the reported fix. Update Apache Software Foundation/log4net to 3.5.0; Apache Software Foundation/log4net to 77717061b20d4346b6c0ce6b54643d85fb348bc7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencelists.apache.org
Upstream source description

Improper Encoding or Escaping of Output vulnerability in the RemoteSyslogAppender of Apache log4net. Every character outside visible ASCII and space was removed from the record instead of being escaped, so non-ASCII text and control characters such as tabs disappeared without notice. A party whose data reaches a log message could make a distinct value look identical in the record, for example a user name holding a zero-width space logged as admin. Only applications that use RemoteSyslogAppender are affected. This issue affects Apache log4net: from 1.2.12 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

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  • Langflow OSS is affected by multiple vulnerabilitiesSame generic ecosystem
  • Langflow OSS is affected by multiple vulnerabilitiesSame generic ecosystem
  • Langflow OSS is affected by multiple vulnerabilitiesSame generic ecosystem
  • Langflow OSS is affected by multiple vulnerabilitiesSame generic ecosystem
  • Langflow OSS is affected by multiple vulnerabilitiesSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-116
Source
CVE List V5
Source checked
Oct 7, 2026
References
3 linked sources
Open source record