Red Hat Security Advisory: tomcat security update
Affects Red Hat tomcatSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 9.1 Critical.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 45% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Apache Software FoundationApache Tomcat | Affected
| Fixed in– |
AI-suggested
Red Hat has released updated Apache Tomcat packages for Red Hat Enterprise Linux 8 (e.g., tomcat-9.0.121-1.el8_10) that address these vulnerabilities. Users should apply these official updates promptly to remediate the security issues. For detailed update instructions, refer to Red Hat's advisory at https://access.redhat.com/articles/11258. No additional mitigation steps are specified beyond applying the provided patches.
Description
Multiple security vulnerabilities have been identified and addressed in Apache Tomcat as packaged by Red Hat Enterprise Linux 8. These include security constraint bypass, access control bypass due to an off-by-one error, improper input validation allowing HTTP/2 no-authority bypass of strict SNI validation, improper authentication from principal lookup failure, authentication bypass via limited replay attack in DIGEST authenticator, and unauthorized resource access via FORM authentication bypass. Red Hat has released updated packages to fix these issues.
References
- access.redhat.com/errata/RHSA-2026:92869 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2524151 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2524154 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2524155 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2524160 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2524161 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2524162 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_92869.json (opens in a new tab)