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CVE record · CVE-2026-105239

Apache log4net: NUL character truncates EventLogAppender records

CVSS 5.3 MediumEPSS 0.0082 · 57th percentile

Published by the CVE Program (CNA: apache) at 6 Oct 2026, 19:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Apache Software Foundation Apache log4net Package name: log4net https://nuget.org/packages pkg:nuget/log4net
  • affected 1.2.9 to before 3.5.0 semver
Other versions: unaffected
Apache Software Foundation Apache log4net Package name: log4net https://nuget.org/packages pkg:nuget/log4net
  • affected 02e1e115435888485f2e28b414d267e39e799e07 to before dc5855a0720c91590fd7a81d729ea01fdd69e000 git
Other versions: unaffected
Identifiers
CVE-2026-105239
CNA
apache
Weakness (CWE)
CWE-158
Tags
Published
6 Oct 2026
Updated
7 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CNA (apache)
  • CISA KEV Not listed.
  • EPSS 0.0082, the 57th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 6 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.