7.3

CVE-2026-42498: apache software foundation apache tomcat

CVSS: 7.3v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-42498DEBIAN-CVE-2026-42498CGA-2g9p-wjp3-93qf
Published 12-05-2026Last modified 13-05-2026
Open JSON

Vulnerability summary

CVE-2026-42498 is a high (CVSS 7.3) vulnerability in apache software foundation apache tomcat. EPSS estimates a 0.65% chance of exploitation in the next 30 days, higher than 49.9% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.3/10
010
High · v3.1 (CVE.org)
EPSS score
0.65%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 28 · Related 15
MGASA-2026-0139OPENSUSE-SU-2026:10925-1OPENSUSE-SU-2026:10926-1OPENSUSE-SU-2026:10927-1OPENSUSE-SU-2026:21117-1OPENSUSE-SU-2026:21121-1

Timeline

  1. 12-05-2026
    PublishedVulnerability first disclosed.
  2. 13-05-2026
    Last modifiedVulnerability information updated.

Description

Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.65%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

0.00 pp

From 0.65% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.65%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard22 products
  • camunda-8.8< 8.8.24-r2
  • camunda-8.9< 8.9.5-r2
  • camunda-zeebe-8.6< 8.6.39-r12
  • camunda-zeebe-8.7< 8.7.29-r1
  • camunda-zeebe-8.8< 8.8.24-r1
Debian3 products
  • tomcat10< 10.1.55-1~deb12u1 | < 10.1.55-1~deb13u1 | < 10.1.55-1
  • tomcat11< 11.0.22-1~deb13u1 | < 11.0.22-1
  • tomcat9< 9.0.70-2
Ubuntu3 products
  • tomcat10< 10.1.16-1ubuntu0.1~esm4 | < 10.1.40-1ubuntu1.25.10.1 | < 10.1.40-1ubuntu1.26.04.1
  • tomcat11All versions (No fix recorded) | < 11.0.18-1ubuntu0.1~esm1
  • tomcat9< 9.0.16-3ubuntu0.18.04.2+esm8 | < 9.0.31-1ubuntu0.9+esm3 | < 9.0.58-1ubuntu0.2+esm4 | < 9.0.70-2ubuntu0.1+esm3 | < 9.0.95-1ubuntu1.1 | < 9.0.115-1ubuntu0.1
Org.apache.tomcat2 products
  • tomcat< 9.0.118 | ≥ 10.1.0-M1, < 10.1.55 | ≥ 11.0.0-M1, < 11.0.22
  • tomcat-catalina< 9.0.118 | ≥ 10.1.0-M1, < 10.1.55 | ≥ 11.0.0-M1, < 11.0.22
Wolfi2 products
  • thingsboard-tb-mqtt-transport< 4.3.1.2-r0
  • thingsboard-tb-node< 4.3.1.2-r0
Apache1 product
  • tomcat≥ 7.0.0, ≤ 7.0.109 | ≥ 8.5.0, ≤ 8.5.100 | ≥ 9.0.0, < 9.0.118 | ≥ 10.1.0, < 10.1.55 | ≥ 11.0.0, < 11.0.22
Apache software foundation1 product
  • apache tomcat≥ 11.0.0-M1, ≤ 11.0.21 | ≥ 10.1.0-M1, ≤ 10.1.54 | ≥ 9.0.2, ≤ 9.0.117 | ≥ 8.5.24, ≤ 8.5.100 | ≥ 7.0.83, ≤ 7.0.109
Org.apache.tomcat.embed1 product
  • tomcat-embed-core< 9.0.118 | ≥ 10.1.0-M1, < 10.1.55 | ≥ 11.0.0-M1, < 11.0.22

8 vendors · 35 products

References

16 links
Show all 16 references