CVE-2026-103119
Apache Tomcat: AJP response mix-up
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
9.1
Apache Tomcat: AJP response mix-up
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.
- Record
CVE-2026-103119- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-127
- Updated
- 2026-11-02
EUVDEUVD-2026-105012
9.1
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.
- Record
EUVD-2026-105012- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-64hx-4gc9-f6v4
9.1
Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could...
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.
- Record
GHSA-64hx-4gc9-f6v4- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-127
- Updated
- 2026-11-02
NVD
9.1
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.
- Record
CVE-2026-103119- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Weakness
- CWE-127
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-103119
9.1
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.
- Record
DEBIAN-CVE-2026-103119- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-103119
9.1
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.
- Record
UBUNTU-CVE-2026-103119- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - Updated
- 2026-11-02
OSVBIT-tomcat-2026-103119 No score
Apache Tomcat: AJP response mix-up
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 through 11.0.26.
Users are recommended to upgrade to version 11.0.27, which fixes the issue.
- Record
BIT-tomcat-2026-103119- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:12256-1 No score
tomcat11-11.0.27-1.1 on GA media
These are all security issues fixed in the tomcat11-11.0.27-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:12256-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
tomcatBitnami |
11.0.0 up to 11.0.27 | 11.0.27 |
tomcat11Debian:13 |
All versions, plus listed versions 11.0.11-111.0.15-111.0.15-1~deb13u111.0.18-111.0.21-1 Show 5 moreShow less11.0.22-111.0.22-1~deb13u111.0.22-211.0.24-111.0.6-1 |
None known |
tomcat11Debian:14 |
All versions, plus listed versions 11.0.11-111.0.15-111.0.15-1~deb13u111.0.18-111.0.21-1 Show 5 moreShow less11.0.22-111.0.22-1~deb13u111.0.22-211.0.24-111.0.6-1 |
None known |
tomcat6Ubuntu:Pro:14.04:LTS |
All versions, plus listed versions 6.0.37-16.0.39-16.0.39-1ubuntu0.16.0.39-1ubuntu0.1+esm16.0.39-1ubuntu0.1+esm26.0.39-1ubuntu0.1+esm3 |
None known |
tomcat7Ubuntu:Pro:14.04:LTS |
All versions, plus listed versions 7.0.42-17.0.47-17.0.50-17.0.52-17.0.52-1ubuntu0.1 Show 13 moreShow less7.0.52-1ubuntu0.37.0.52-1ubuntu0.67.0.52-1ubuntu0.77.0.52-1ubuntu0.87.0.52-1ubuntu0.97.0.52-1ubuntu0.107.0.52-1ubuntu0.117.0.52-1ubuntu0.137.0.52-1ubuntu0.147.0.52-1ubuntu0.157.0.52-1ubuntu0.167.0.52-1ubuntu0.16+esm17.0.52-1ubuntu0.16+esm2 |
None known |
tomcat8Ubuntu:Pro:16.04:LTS |
All versions, plus listed versions 8.0.26-18.0.28-18.0.30-18.0.32-18.0.32-1ubuntu1 Show 14 moreShow less8.0.32-1ubuntu1.18.0.32-1ubuntu1.28.0.32-1ubuntu1.38.0.32-1ubuntu1.48.0.32-1ubuntu1.58.0.32-1ubuntu1.68.0.32-1ubuntu1.78.0.32-1ubuntu1.88.0.32-1ubuntu1.98.0.32-1ubuntu1.108.0.32-1ubuntu1.118.0.32-1ubuntu1.138.0.32-1ubuntu1.13+esm18.0.32-1ubuntu1.13+esm2 |
None known |
tomcat7Ubuntu:Pro:16.04:LTS |
All versions, plus listed versions 7.0.64-17.0.68-17.0.68-1ubuntu0.17.0.68-1ubuntu0.37.0.68-1ubuntu0.4 Show 4 moreShow less7.0.68-1ubuntu0.4+esm17.0.68-1ubuntu0.4+esm27.0.68-1ubuntu0.4+esm37.0.68-1ubuntu0.4+esm4 |
None known |
tomcat8Ubuntu:Pro:18.04:LTS |
All versions, plus listed versions 8.5.21-1ubuntu18.5.29-18.5.30-18.5.30-1ubuntu18.5.30-1ubuntu1.2 Show 11 moreShow less8.5.30-1ubuntu1.38.5.30-1ubuntu1.48.5.39-1ubuntu1~18.04.18.5.39-1ubuntu1~18.04.28.5.39-1ubuntu1~18.04.38.5.39-1ubuntu1~18.04.3+esm18.5.39-1ubuntu1~18.04.3+esm28.5.39-1ubuntu1~18.04.3+esm38.5.39-1ubuntu1~18.04.3+esm48.5.39-1ubuntu1~18.04.3+esm58.5.39-1ubuntu1~18.04.3+esm6 |
None known |
tomcat9Ubuntu:Pro:18.04:LTS |
All versions, plus listed versions 9.0.16-3~18.04.19.0.16-3ubuntu0.18.04.19.0.16-3ubuntu0.18.04.29.0.16-3ubuntu0.18.04.2+esm19.0.16-3ubuntu0.18.04.2+esm2 Show 6 moreShow less9.0.16-3ubuntu0.18.04.2+esm39.0.16-3ubuntu0.18.04.2+esm49.0.16-3ubuntu0.18.04.2+esm59.0.16-3ubuntu0.18.04.2+esm69.0.16-3ubuntu0.18.04.2+esm79.0.16-3ubuntu0.18.04.2+esm8 |
None known |
tomcat9Ubuntu:Pro:20.04:LTS |
All versions, plus listed versions 9.0.24-19.0.27-19.0.31-19.0.31-1ubuntu0.19.0.31-1ubuntu0.2 Show 10 moreShow less9.0.31-1ubuntu0.39.0.31-1ubuntu0.49.0.31-1ubuntu0.59.0.31-1ubuntu0.69.0.31-1ubuntu0.79.0.31-1ubuntu0.89.0.31-1ubuntu0.99.0.31-1ubuntu0.9+esm19.0.31-1ubuntu0.9+esm29.0.31-1ubuntu0.9+esm3 |
None known |
Show 10 moreShow less
| Package | Affected | Fixed |
|---|---|---|
tomcat9Ubuntu:Pro:22.04:LTS |
All versions, plus listed versions 9.0.43-39.0.54-19.0.55-19.0.58-19.0.58-1ubuntu0.1 Show 9 moreShow less9.0.58-1ubuntu0.1+esm19.0.58-1ubuntu0.1+esm29.0.58-1ubuntu0.1+esm39.0.58-1ubuntu0.1+esm49.0.58-1ubuntu0.29.0.58-1ubuntu0.2+esm19.0.58-1ubuntu0.2+esm29.0.58-1ubuntu0.2+esm39.0.58-1ubuntu0.2+esm4 |
None known |
tomcat10Ubuntu:24.04:LTS |
All versions, plus listed versions 10.1.10-110.1.14-110.1.15-110.1.16-110.1.16-1ubuntu0.1~esm1 Show 4 moreShow less10.1.16-1ubuntu0.1~esm210.1.16-1ubuntu0.1~esm310.1.16-1ubuntu0.1~esm410.1.55-1ubuntu2~24.04.1 |
None known |
tomcat9Ubuntu:24.04:LTS |
All versions, plus listed versions 9.0.70-1ubuntu19.0.70-29.0.70-2ubuntu0.19.0.70-2ubuntu0.1+esm19.0.70-2ubuntu0.1+esm29.0.70-2ubuntu0.1+esm39.0.118-1~24.04.1 |
None known |
tomcat10Ubuntu:26.10 |
All versions, plus listed versions 10.1.40-1ubuntu110.1.54-110.1.54-1ubuntu110.1.54-1ubuntu210.1.55-1ubuntu110.1.55-1ubuntu210.1.57~us1-0ubuntu1 |
None known |
tomcat11Ubuntu:26.10 |
All versions, plus listed versions 11.0.18-111.0.22-211.0.22-2ubuntu111.0.22-2ubuntu211.0.24-1ubuntu1 |
None known |
tomcat9Ubuntu:26.10 |
All versions, plus listed versions 9.0.115-19.0.115-1ubuntu19.0.118-1 |
None known |
tomcat10Ubuntu:26.04:LTS |
All versions, plus listed versions 10.1.40-1ubuntu110.1.40-1ubuntu1.26.04.110.1.55-1ubuntu2~26.04.1 |
None known |
tomcat9Ubuntu:26.04:LTS |
All versions, plus listed versions 9.0.95-1ubuntu19.0.111-19.0.115-19.0.115-1ubuntu0.19.0.118-1~26.04.1 |
None known |
tomcat11Ubuntu:26.04:LTS |
All versions, plus listed versions 11.0.6-111.0.11-111.0.15-111.0.18-111.0.18-1ubuntu0.1~esm111.0.22-2ubuntu2~26.04.1 |
None known |
tomcat11openSUSE:Tumbleweed |
before 11.0.27-1.1 | 11.0.27-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-103119 is a critical vulnerability (CVSS 9.1) in Apache Software Foundation Tomcat, published October 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in tomcat 11.0.27.
References
lists.apache.org/thread.html/sk2cg4k077fwcqbm6tqz2n700nq06h80
openwall.com/lists/oss-security/2026/10/20/28
nvd.nist.gov/vuln/detail/CVE-2026-103119
github.com/advisories/GHSA-64hx-4gc9-f6v4
security-tracker.debian.org/tracker/CVE-2026-103119
ubuntu.com/security/CVE-2026-103119
Show 9 moreShow less
cve.org/CVERecord?id=CVE-2026-103119
github.com/apache/tomcat/commit/f13748baa17a5e28925be455e0e2832e2032f58c
suse.com/security/cve/CVE-2026-101296
suse.com/security/cve/CVE-2026-101356
suse.com/security/cve/CVE-2026-103119
suse.com/security/cve/CVE-2026-74048
suse.com/security/cve/CVE-2026-74049
suse.com/security/cve/CVE-2026-88041
suse.com/security/cve/CVE-2026-93446