CVE-2026-86243

Apache Tomcat Native: DoS via TLS handshake

At a glance

Severity: HIGH 7.5
EPSS: EPSS 0.56 % · percentile 47 (2026-10-27)
State: PUBLISHED
Published: 2026-09-23
Updated: 2026-09-23
Assigner: apache
NVD status: Analyzed

Description

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Weaknesses (CWE)

CWE-126

European references

ENISA EUVD · EUVD-2026-85267
GCVE · GCVE-0-2026-86243

Affected configurations (NVD CPE)

cpe:2.3:a:apache:tomcat_native:*:*:*:*:*:*:*:* ≥ 1.3.0 < 1.3.9
cpe:2.3:a:apache:tomcat_native:*:*:*:*:*:*:*:* ≥ 2.0.0 < 2.0.16

Affected products

Product	Versions
Apache Software Foundation · Apache Tomcat Native	affected 2.0.0 ≤ 2.0.15 ; affected 1.3.0 ≤ 1.3.8

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD