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CVE-2026-24880 Apache Tomcat

Affected softwareApache Tomcat
Severity7.5 High CVSS 3.1
Fixed in9.0.116, 10.1.52, 11.0.20
WeaknessCWE-444
Published9 Apr 2026
Updated26 Oct 2026

Description

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat via invalid chunk extension. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M1 through 9.0.115, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other, unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.20, 10.1.52 or 9.0.116, which fix the issue.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed, none at 5+ stars
  • EPSS 0.71% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC CVE-2026-24880: does Apache's upgrade advice actually apply to your Tomcat? Detects the fix by class presence, not version comparison. Covers 7.0/8.0/8.5/9.0/10.0/10.1/11.0 lines. 2026-09-01

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: apache/tomcat 1b586d6.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update October 2026 ↗ CPU 2026-Q4 Oracle Communications / Microservices (Apache Tomcat) (7.0.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Microservices (Apache Tomcat) 7.0.0 7.0.0

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat:tomcat-coyote 7.0.0 9.0.116 unbounded
org.apache.tomcat:tomcat-coyote 10.1.0-M1 10.1.52 unbounded
org.apache.tomcat:tomcat-coyote 11.0.0-M1 11.0.20 unbounded
org.apache.tomcat.embed:tomcat-embed-core 7.0.0 9.0.116 unbounded
org.apache.tomcat.embed:tomcat-embed-core 10.1.0-M1 10.1.52 unbounded
org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M1 11.0.20 unbounded

Products and versions

3 products, 9 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic ≥ 9.0.0 and < 9.0.116 · ≥ 10.1.0 and < 10.1.53 · ≥ 11.0.0 and < 11.0.20
osv org.apache.tomcat tomcat-coyote generic ≥ 7.0.0 and < 9.0.116 · ≥ 10.1.0 and < 10.1.52 · ≥ 11.0.0 and < 11.0.20
osv org.apache.tomcat.embed tomcat-embed-core generic ≥ 7.0.0 and < 9.0.116 · ≥ 10.1.0 and < 10.1.52 · ≥ 11.0.0 and < 11.0.20

References

URLTags
https://github.com/apache/tomcat/commit/1b586d6aa8ae65726da5fa8799427b5d4718478a WEB
https://github.com/apache/tomcat/commit/1e71441a15972f56e661b0b549fb9e5d838b83bb WEB
https://github.com/apache/tomcat/commit/2cb06c34f661ca42f7570bbcc21e99806184bcc5 WEB
https://github.com/apache/tomcat/commit/6d478dbe18b7c4bb671c30fedf130309b0dab77c WEB
https://github.com/apache/tomcat/commit/f07df938d00f7419b40fa65aa912966d0efac522 WEB
https://github.com/apache/tomcat/commit/fde1a8235fb73125217bd41e162aa0a113f33552 WEB
https://github.com/apache/tomcat PACKAGE
https://lists.apache.org/thread/2c682qnlg2tv4o5knlggqbl9yc2gb5sn WEB
https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.53 WEB
https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.20 WEB

Timeline

Published2026-04-09By the CVE Program.
NVD record modified2026-10-26NVD's own last-modified date for this record.