CVE-2026-78437

EUVD-2026-85231
Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.



This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.



Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
apacheCNA
7.3 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
apachetomcat
11.0.19 ≤
𝑥
≤ 11.0.25
CNA
apachetomcat
10.1.53 ≤
𝑥
≤ 10.1.59
CNA
apachetomcat
9.0.116 ≤
𝑥
≤ 9.0.121
CNA
Debian logo
Debian Releases
Debian Product
Codename
tomcat10
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
10.1.60-1
fixed
trixie
vulnerable
trixie (security)
vulnerable
tomcat11
forky
vulnerable
sid
vulnerable
trixie
vulnerable
trixie (security)
vulnerable
tomcat9
bookworm
9.0.70-2
fixed
forky
9.0.118-1
fixed
sid
9.0.122-1
fixed
trixie
9.0.95-1
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg
http://www.openwall.com/lists/oss-security/2026/09/23/26