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CVE Record

CVE-2026-24734: Apache Tomcat Native, Apache Tomcat: OCSP revocation bypass

Improper Input Validation vulnerability in Apache Tomcat Native, Apache Tomcat. When using an OCSP responder, Tomcat Native (and Tomcat's FFM port of the Tomcat Native code) did not complete verification or freshness checks on the OCSP response which could allow certificate revocation to be bypassed. This issue affects Apache Tomcat Native:  from 1.3.0 through 1.3.4, from 2.0.0 through 2.0.11; Apache Tomcat: from 11.0.0-M1 through 11.0.17, from 10.1.0-M7 through 10.1.51, from 9.0.83 through 9.0.114. The following versions were EOL at the time the CVE was created but are known to be affected: from 1.1.23 through 1.1.34, from 1.2.0 through 1.2.39. Older EOL versions are not affected. Apache Tomcat Native users are recommended to upgrade to versions 1.3.5 or later or 2.0.12 or later, which fix the issue. Apache Tomcat users are recommended to upgrade to versions 11.0.18 or later, 10.1.52 or later or 9.0.115 or later which fix the issue.

HighCVSS 7.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-24734 is a high-severity certificate validation flaw in Apache Tomcat Native and Tomcat. In OCSP-based revocation checking, affected versions could accept insufficiently verified or stale OCSP responses, allowing a revoked certificate to be treated as valid.

Executive priority

Treat this as a priority patch for certificate-sensitive Tomcat services. It is not cited as actively exploited, but it can weaken authentication and encrypted trust decisions where OCSP revocation checking is relied upon.

Technical view

Affected Tomcat Native and Tomcat FFM native code did not fully verify OCSP response validity or freshness. The issue maps to CWE-20 and CWE-295, has CVSS 7.4, and impacts confidentiality and integrity without requiring authentication or user interaction, though attack complexity is high.

Likely exposure

Exposure is most likely where affected Tomcat or Tomcat Native versions use an OCSP responder for certificate revocation checking, especially internet-facing TLS or mTLS services that rely on revocation decisions.

Exploitation context

The provided sources do not show KEV listing, active exploitation, or public exploit details. The business concern is trust bypass: revoked certificates may not be rejected in affected OCSP validation paths.

Researcher notes

Affected ranges are explicit: Tomcat Native 1.3.0-1.3.4 and 2.0.0-2.0.11; Tomcat 11.0.0-M1-11.0.17, 10.1.0-M7-10.1.51, and 9.0.83-9.0.114. Some EOL Native 1.1.x and 1.2.x releases are also affected.

Mitigation direction

  • Upgrade Tomcat Native to 1.3.5 or later, or 2.0.12 or later.
  • Upgrade Tomcat to 11.0.18, 10.1.52, or 9.0.115 or later.
  • Replace affected EOL Tomcat Native 1.1.x or 1.2.x deployments with supported fixed versions.
  • For Red Hat-packaged deployments, follow the referenced Red Hat errata and product guidance.
  • Prioritize systems using OCSP, client certificates, or certificate-based service authentication.

Validation and detection

  • Inventory Tomcat and Tomcat Native versions across production, staging, and container images.
  • Confirm whether OCSP responder-based revocation checking is configured or required.
  • Verify fixed upstream versions or vendor-backported package versions are installed.
  • Review Red Hat CVE, VEX, and errata records for downstream product applicability.
  • Document any EOL Tomcat Native installations and migration ownership.
Prepared
Confidence
high
Sources
12

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-20: 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.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-295: 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.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-24734 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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
2ADP providers
12Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical 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
7.4CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2CISA-ADP
7.4CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N2.25.2redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.4High
CVSS 3.1 vector shape for CVE-2026-24734Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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
redhat-SADPtomcat: Apache Tomcat: Certificate revocation bypass due to improper OCSP response validation
other:Red Hat severity ratingcvssV3_1
  • 2026-02-17T20:03:45.051Z: Reported to Red Hat.
  • 2026-02-17T18:53:12.228Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Apache Software FoundationApache Tomcat Native1.1.23, 1.2.0, 1.3.0, 2.0.0unaffected
Apache Software FoundationApache Tomcat11.0.0-M1, 10.1.0-M7, 9.0.83, 0unaffected
Weakness

CWE details

CWE-20CWE-295

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

CWE-20 · source CWE mapping

Improper Input Validation

Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-295 · source CWE mapping

Improper Certificate Validation

Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs