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Fencer Intel
critical 9.1

CVE-2026-103119 json

Apache Tomcat: AJP response mix-up

published 20d ago modified 11d ago also BIT-tomcat-2026-103119 , EUVD-2026-105012

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second.

This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26.

Users are recommended to upgrade to version 11.0.27, which fixes the issue.

Patch / fix

  • bitnami tomcat 11.0.27
  • tomcat11 openSUSE Tumbleweed 11.0.27-1.1

opensuse advisories openSUSE-SU-2026:12256-1

Is CVE-2026-103119 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-103119 updated cvss 4.8

tomcat: Apache Tomcat: Information disclosure via buffer under-read during non-blocking writes

  • Red Hat Hardened Images tomcat10 10.1.61-0.1.hum1, tomcat11 11.0.27-0.1.hum1, tomcat10-lib 10.1.61-0.1.hum1, tomcat11-lib 11.0.27-0.1.hum1, tomcat10-common 10.1.61-0.1.hum1, tomcat11-common 11.0.27-0.1.hum1, +14 more
    fixed: vendor fix RHSA-2026:85926

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
20d ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami tomcat
>=11.0.0, <11.0.27
11.0.27

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness

References

Sources

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