CVE-2026-34486
Exploitation confirmed. First attested on 2026-08-04 by CISA-ADP, CISA KEV, GCVE · kevintel.
- Published2026-04-09
- WeaknessCWE-311 · CWE-807
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
Missing Encryption of Sensitive Data vulnerability in Apache Tomcat due to the fix for CVE-2026-29146 allowing the bypass of the EncryptInterceptor. This issue affects Apache Tomcat: 11.0.20, 10.1.53, 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-34486?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-34486?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.8 | = 8.8 | no fix published | NVD |
| 9.2 | = 9.2 | no fix published | NVD |
| 9.4 | = 9.4 | no fix published | NVD |
| 9.6 | = 9.6 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.0 | = 9.0.116 | no fix published | NVD |
| 10.1 | = 10.1.53 | no fix published | NVD |
| 11.0 | = 11.0.20 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 8.0 | = 8.0 | no fix published | NVD |
| 9.0 | = 9.0 | no fix published | NVD |
| 10.0 | = 10.0 | no fix published | NVD |
4 more products in the sources.
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 JBoss Web Server 7.0.0 security release
Red Hat Security Advisory: Red Hat JBoss Web Server 7.0.0 security release
Fix
- CISA’s required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-08-07
- Vendor fix Red Hat Product Security RHSA-2026:39188 · 33 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:39189 · 1 productBefore applying the update, back up your existing Red Hat JBoss Web Server installation, including all applications and configuration files. The References section of this erratum contains a download link for the update. You must be logged in to download the update.
- Workaround from the vendor Red Hat Product Security RHSA-2026:39188 · 90 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Advisories and patches
- lists.apache.orgVendor Advisory
- www.vicarius.ioMitigation
Detection
read 2026-10-23 19:25 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 5 repositories, unverifiedAirSkye/CVE-2026-34486-poc404-src/CVE-2026-34486striga-ai/CVE-2026-34486razureink/cve-2026-34486-tomcat_encrypt_bypass_reproductionCypherHippie/CVE-2026-34486---unauthenticated-RCE-via-Java-deserialization PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2026-08-04
- Patch Due Date
- 2026-08-07
- Ransomware Use
- Unknown
- Required Action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Sources
- NVDCVE recordread 2026-10-23
- CISA KEVKEV entry2026-08-04
- GCVEexploitation2026-08-04
- CISA-ADPSSVC decisionactive2026-08-07
- OpenCVESSVC decisionactive—
- CISA-ADPCVSS 3.17.52026-04-10
- CNACVSS 3.17.5read 2026-10-23
- CNAweakness (CWE)CWE-311, CWE-807read 2026-10-23
- FIRST EPSSEPSS score6.6 %2026-10-22
- PoC-in-GitHubproof of concept5read 2026-10-23
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
- 2026-04-09
- Last Modified
- 2026-09-21
- NVD status
- Analyzed
Frequently asked questions
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.