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9.1
CVE-2026-103119: Apache Tomcat on Debian could leak data
CVE-2026-103119 · published 3 days ago
Summary
Debian packages of Apache Tomcat (versions 6, 7, and 11) contain a buffer under-read issue that may allow an attacker to read memory contents. This could expose sensitive information from the server. Apply the latest security updates for the affected Tomcat packages as soon as possible.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| – | apache software foundation | apache tomcat | <= 11.0.26 |
| Debian:13 | debian | tomcat11 | All versions |
| Ubuntu:26.10 | canonical | tomcat11 | All versions |
| Ubuntu:Pro:14.04:LTS | canonical | tomcat6 | All versions |
| Ubuntu:Pro:14.04:LTS | canonical | tomcat7 | All versions |
| Ubuntu:Pro:16.04:LTS | canonical | tomcat8 | All versions |
| Ubuntu:Pro:18.04:LTS | canonical | tomcat9 | All versions |
| Ubuntu:24.04:LTS | canonical | tomcat10 | All versions |
Original advisory text
DEBIAN-CVE-2026-103119
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.
References
- https://lists.apache.org/thread.html/sk2cg4k077fwcqbm6tqz2n700nq06h80
- http://www.openwall.com/lists/oss-security/2026/10/20/28
- https://security-tracker.debian.org/tracker/CVE-2026-103119 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-103119 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-103119 Third Party Advisory
- https://github.com/apache/tomcat/commit/f13748baa17a5e28925be455e0e2832e2032f58c Third Party Advisory
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically
- Gives an attacker partial control
Severity
9.1
Critical
Type
CWE-127Buffer Under-read
Timeline
Published20 Oct 2026
Updated23 Oct 2026
First seen20 Oct 2026
Sources
CVE-2026-103119 · NVD
CVE-2026-103119 · MITRE
DEBIAN-CVE-2026-103119 · OSV
UBUNTU-CVE-2026-103119 · OSV
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