CVE-2026-105244

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-10-06. A secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 5.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

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.

CVSS v3
5.3
EG Score
5.3MEDIUMhigh confidence
EG Risk
39
EG Risk 39/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 6, 2026

Last Modified

October 7, 2026

Advisory Details (3)

Auto-updated Oct 6, 2026
Fix named in the CVE record. Sources: github_pr, github_commit.
generic

Pony Mail

https://lists.apache.org/thread.html/q7649hhdodthoqw8jsjgtnb4m8qfy6d6
github_commit

commit 77717061b20d (apache/logging-log4net)

Fix landed in apache/logging-log4net commit 77717061b20d — awaiting tagged release

https://github.com/apache/logging-log4net/commit/77717061b20d4346b6c0ce6b54643d85fb348bc7
github_pr

Escaping special characters in multiple appenders

Fix merged in apache/logging-log4net PR #315 on 2026-09-04 — awaiting tagged release

https://github.com/apache/logging-log4net/pull/315

Vendor Advisories for CVE-2026-105244(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-07 15:31 UTCEG score recompute
  2. 2026-10-07 15:31 UTCGHSA enrichment
  3. 2026-10-07 15:02 UTCEG score recompute
  4. 2026-10-07 15:02 UTCGHSA enrichment
  5. 2026-10-07 13:46 UTCGHSA enrichment
  6. 2026-10-07 07:28 UTCEG score recompute
  7. 2026-10-07 07:28 UTCGHSA enrichment
  8. 2026-10-07 06:23 UTCEG score recompute
  9. 2026-10-07 06:23 UTCGHSA enrichment
  10. 2026-10-06 20:32 UTCEG score recompute
  11. 2026-10-06 19:58 UTCEG score recompute
  12. 2026-10-06 19:56 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-105244?
CVE-2026-105244 is a medium vulnerability published on October 6, 2026. 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…
When was CVE-2026-105244 disclosed?
CVE-2026-105244 was first published on October 6, 2026, with the most recent update on October 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-105244?
CVE-2026-105244 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-105244?
The CVE record for CVE-2026-105244 names the fix: "Users are recommended to upgrade to version 3.5.0, which fixes the issue." The vendor advisories EchelonGraph has for CVE-2026-105244 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-105244

Explore →

Is Your Infrastructure Affected by CVE-2026-105244?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs