CVE-2026-105243
- Source
- https://cve.org/CVERecord?id=CVE-2026-105243
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105243.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-105243
- Downstream
- Published
- 2026-10-06T19:51:25Z
- Modified
- 2026-10-28T02:30:50Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
- Summary
- Apache log4net: Oversize EventLogAppender record silently discarded
- Details
-
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.
- Database specific
{ "cna_assigner": "apache", "cwe_ids": [ "CWE-778" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105243.json" }- References
-
- http://www.openwall.com/lists/oss-security/2026/10/07/17
- https://nuget.org/packages
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105243.json
- https://lists.apache.org/thread.html/jr6fj5skv1vnjbc9jmt8bp151p8ow1rp
- https://nvd.nist.gov/vuln/detail/CVE-2026-105243
- https://github.com/apache/logging-log4net/commit/28fbfb25678c48a8cc5bc9b94ead0dddfc39ffed
- https://github.com/apache/logging-log4net/pull/315
- https://gitbox.apache.org/repos/asf/logging-log4net.git
Affected packages
Git / gitbox.apache.org/repos/asf/logging-log4net.git
Affected ranges
- Type
- GIT
- Repo
- https://gitbox.apache.org/repos/asf/logging-log4net.git
- Events
-
Introduced02e1e115435888485f2e28b414d267e39e799e07Fixed28fbfb25678c48a8cc5bc9b94ead0dddfc39ffed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "02e1e115435888485f2e28b414d267e39e799e07" }, { "fixed": "28fbfb25678c48a8cc5bc9b94ead0dddfc39ffed" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" } ] }
- Type
- GIT
- Repo
- https://github.com/apache/logging-log4net
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "cpe": "cpe:2.3:a:apache:log4net:*:*:*:*:*:*:*:*", "range": [ { "introduced": "1.2.9" }, { "fixed": "3.5.0" } ], "source": "CPE_RANGE" }, { "range": [ { "fixed": "28fbfb25678c48a8cc5bc9b94ead0dddfc39ffed" } ], "source": "REFERENCES_COMMIT" } ] }
Affected versions
rc/3.*
rc/3.0.1-preview.1
rc/3.0.1-preview.2
rc/3.0.1-rc1
rc/3.0.2-rc1
rc/3.0.3-preview.1
rc/3.0.3-rc1
rc/3.0.4-preview.1
rc/3.0.4-rc1
rc/3.1.0-rc1
rc/3.2.0-preview.1
rc/3.2.0-rc1
rc/3.3.0-rc1
rc/3.3.1-rc1
rc/3.3.2-rc1
rc/3.4.0-preview.1
rc/3.4.0-rc1
rc/3.4.1-preview.1
Other
rc/temp
rel/2.*
rel/2.0.10
rel/2.0.11
rel/2.0.12
rel/2.0.13
rel/2.0.14
rel/2.0.15
rel/2.0.16
rel/2.0.17
rel/2.x
rel/3.*
rel/3.0.1
rel/3.0.2
rel/3.0.3
rel/3.0.4
rel/3.1.0
rel/3.2.0
rel/3.3.0
rel/3.3.1
rel/3.3.2
rel/3.4.0