CVE-2026-88041
No exploitation reported by the sources we read.
- Published2026-10-20
- Fixed in11.0.27 · 10.1.61 · 9.0.123
- WeaknessCWE-459
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request. This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122. Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.
Timeline
dates in UTC- 2026-10-2014:17CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-30 09:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-88041?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-88041?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 11.0 | ≥ 11.0.0, < 11.0.27 | 11.0.27 | OSV |
| 10.1 | ≥ 10.1.27, < 10.1.61 | 10.1.61 | OSV |
| 9.0 | ≥ 9.0.92, < 9.0.123 | 9.0.123 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Fix
- Update tomcat to 11.0.27 · 10.1.61 · 9.0.123
- Vendor fix Red Hat Product Security RHSA-2026:85926 · 31 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Workaround from the vendor Red Hat Product Security RHSA-2026:85926 · 31 productsConfigure front-end reverse proxies to strip HTTP trailer headers and disable backend persistent connection pooling, or set maxKeepAliveRequests="1" on Tomcat HTTP connectors to force separate connections for each request.
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- 2026-10-20
- Last Modified
- 2026-10-29
- NVD status
- Deferred
Frequently asked questions
What is CVE-2026-88041?
Is CVE-2026-88041 actively exploited?
What is the CVSS score for CVE-2026-88041?
Running Apache Tomcat? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.