CVE-2026-24880 | Apache Tomcat: Request smuggling via invalid chunk extension

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.

Published: 2026-04-09 Last update: 2026-04-14 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-24880 is rated Moderate Risk (45.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.21%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-24880

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-15 0.02% 0.21% +0.20%
2 2026-04-10 — 0.02% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-24880

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-24880

GitHub Security Advisory for CVE-2026-24880

GHSA-563x-q5rq-57qp · Severity: high · Ecosystem: maven — Apache Tomcat has an HTTP Request/Response Smuggling vulnerability

OS Trackers for CVE-2026-24880

vendor priority summary link
debian not yet assigned CVE-2026-24880 not yet assigned priority: Debian including 3 source packages (tomcat10, tomcat11, tomcat9), 12 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 12. https://security-tracker.debian.org/tracker/CVE-2026-24880
redhat low — https://access.redhat.com/security/cve/CVE-2026-24880
suse medium CVE-2026-24880 severity moderate: SUSE including 33 source package names (tomcat-9.0.117-1.1, tomcat-admin-webapps-9.0.117-1.1, …), 33 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 33. https://www.suse.com/security/cve/CVE-2026-24880/
ubuntu medium CVE-2026-24880 medium priority: Ubuntu including 6 source packages (tomcat10, tomcat11, tomcat6, tomcat7, tomcat8, tomcat9), 33 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needs-triage 18, DNE 12, ignored 3. https://ubuntu.com/security/CVE-2026-24880

Affected software / configurations for CVE-2026-24880

Vendor Product Version Raw CPE
apache tomcat >= 9.0.0, < 9.0.116 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 10.1.0, < 10.1.53 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 11.0.0, < 11.0.20 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

References for CVE-2026-24880

cvelogic Threat Intelligence