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Response snapshot Nov 4, 2026, 04:16 UTC

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VulnerabilityCVE-2026-24734

Apache Tomcat has an Improper Input Validation vulnerability

Improper Input Validation vulnerability in Apache Tomcat Native, Apache Tomcat.

At a glance

Exploited
Not known
Severity
7.5 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: org.apache.tomcat:tomcat-coyote: 11.0.18; org.apache.tomcat:tomcat-coyote: 10.1.52; org.apache.tomcat:tomcat-coyote: 9.0.115; org.apache.tomcat.embed:tomcat-embed-core: 11.0.18; org.apache.tomcat.embed:tomcat-embed-core: 10.1.52; org.apache.tomcat.embed:tomcat-embed-core: 9.0.115; org.apache.tomcat:tomcat-coyote-ffm: 11.0.18; org.apache.tomcat:tomcat-coyote-ffm: 10.1.52; org.apache.tomcat:tomcat-coyote-ffm: 9.0.115. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-mgp5-rv84-w37q (opens a new tab)

What happened

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.

Continue reading

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.

Affected package ranges reported by GitHub: org.apache.tomcat:tomcat-coyote: >= 11.0.0-M1, < 11.0.18 org.apache.tomcat:tomcat-coyote: >= 10.1.0-M7, < 10.1.52 org.apache.tomcat:tomcat-coyote: >= 9.0.83, < 9.0.115 org.apache.tomcat.embed:tomcat-embed-core: >= 11.0.0-M1, < 11.0.18 org.apache.tomcat.embed:tomcat-embed-core: >= 10.1.0-M7, < 10.1.52 org.apache.tomcat.embed:tomcat-embed-core: >= 9.0.83, < 9.0.115 org.

apache.tomcat:tomcat-coyote-ffm: >= 11.0.0-M1, < 11.0.18 org.apache.tomcat:tomcat-coyote-ffm: >= 10.1.0-M7, < 10.1.52 org.apache.tomcat:tomcat-coyote-ffm: >= 9.0.83, < 9.0.115

Scores and how they were measured

CVSS base severity

7.5

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-mgp5-rv84-w37q (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-mgp5-rv84-w37q, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 4). Apache Tomcat has an Improper Input Validation vulnerability (CVE-2026-24734). https://kevwire.com/record/CVE-2026-24734

MLA

"Apache Tomcat has an Improper Input Validation vulnerability (CVE-2026-24734)." KEVWire, 4 Nov. 2026, kevwire.com/record/CVE-2026-24734.

Chicago

KEVWire. "Apache Tomcat has an Improper Input Validation vulnerability (CVE-2026-24734)." Last modified November 4, 2026. https://kevwire.com/record/CVE-2026-24734.

Evidence summary (plain text)

Apache Tomcat has an Improper Input Validation vulnerability (Feb 17, 2026).
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.
CVSS 7.5 (version 3.1; evidence as of Nov 4, 2026; https://github.com/advisories/GHSA-mgp5-rv84-w37q).
Sources:
GitHub-reviewed advisory GHSA-mgp5-rv84-w37q: https://github.com/advisories/GHSA-mgp5-rv84-w37q
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-24734.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 4, 2026, 04:15 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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