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CVE record · CVE-2026-105240

Apache log4net: NUL character truncates OutputDebugStringAppender records

CVSS 5.3 MediumEPSS 0.0081 · 56th percentile

Published by the CVE Program (CNA: apache) at 6 Oct 2026, 19:47 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 6046fe9d7f353b49fe995361c071ec2eea8f7ef6 git
Other versions: unaffected
Identifiers
CVE-2026-105240
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 0.0081, the 56th percentile, on 5 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.