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CVE Record

CVE-2026-34486: Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor

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.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-34486 is a high-severity Apache Tomcat issue where sensitive data expected to be protected by EncryptInterceptor may not be encrypted. The main business risk is confidentiality exposure, not service outage or data tampering, based on the supplied CVSS and advisory data.

Executive priority

Prioritize remediation for internet-facing, partner-facing, or sensitive-data Tomcat environments. This is not listed as KEV in the supplied bundle, but the confidentiality impact and unauthenticated network vector justify prompt patching.

Technical view

Apache describes this as missing encryption of sensitive data caused by the CVE-2026-29146 fix allowing bypass of Tomcat EncryptInterceptor. Affected versions are Tomcat 11.0.20, 10.1.53, and 9.0.116. Fixed versions are 11.0.21, 10.1.54, and 9.0.117.

Likely exposure

Exposure is most likely where affected Tomcat versions are deployed and EncryptInterceptor is relied on to protect sensitive traffic or data. The bundle does not establish that all Tomcat deployments are practically exposed.

Exploitation context

The CVSS vector indicates network reachability, low complexity, no privileges, and no user interaction, with high confidentiality impact. The bundle marks KEV as false and provides no supported evidence of active exploitation.

Researcher notes

The supplied sources support a confidentiality-focused EncryptInterceptor bypass, not integrity or availability impact. Third-party reference titles mention RCE, but the provided CVE facts and CVSS vector do not support treating this as remote code execution.

Mitigation direction

  • Upgrade Tomcat 11.0.20 to 11.0.21 or later.
  • Upgrade Tomcat 10.1.53 to 10.1.54 or later.
  • Upgrade Tomcat 9.0.116 to 9.0.117 or later.
  • Apply applicable Red Hat security advisories for packaged deployments.
  • Use vendor guidance if upgrade timing requires interim controls.

Validation and detection

  • Inventory Tomcat versions across servers, containers, and base images.
  • Confirm whether EncryptInterceptor is configured or relied upon.
  • Verify upgraded runtime reports a fixed Tomcat version.
  • For Red Hat systems, confirm the relevant RHSA package update is applied.
  • Document remaining affected instances with owners and remediation dates.
Prepared
Confidence
high
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-311: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cwe · low confidence lookup

CWE-807: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-34486 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
3ADP providers
17Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6CISA-ADP
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-34486Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
CVECVE Program Container
redhat-SADPApache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass
other:Red Hat severity ratingcvssV3_1
  • 2026-04-09T20:01:26.022Z: Reported to Red Hat.
  • 2026-04-09T19:35:35.994Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Apache Software FoundationApache Tomcat11.0.20, 10.1.53, 9.0.116unaffected
Weakness

CWE details

CWE-311CWE-807

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-311 · source CWE mapping

Missing Encryption of Sensitive Data

Missing Encryption of Sensitive Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-807 · source CWE mapping

Reliance on Untrusted Inputs in a Security Decision

Reliance on Untrusted Inputs in a Security Decision represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs