CVE-2026-24733 | Apache Tomcat: Security constraint bypass with HTTP/0.9

Improper Input Validation vulnerability in Apache Tomcat. Tomcat did not limit HTTP/0.9 requests to the GET method. If a security constraint was configured to allow HEAD requests to a URI but deny GET requests, the user could bypass that constraint on GET requests by sending a (specification invalid) HEAD request using HTTP/0.9. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0.M1 through 9.0.112. Older, EOL versions are also affected. Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fixes the issue.

Published: 2026-02-17 Last update: 2026-03-11 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-24733 is rated Low Risk (27.8/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.16%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2026-24733

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 2026-03-12 0.04% 0.16% +0.12%
2 2026-02-18 — 0.04% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-24733

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.7 3.1 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 1.4 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-24733

GitHub Security Advisory for CVE-2026-24733

GHSA-qq5r-98hh-rxc9 · Severity: low · Ecosystem: maven — Apache Tomcat - Security constraint bypass with HTTP/0.9

OS Trackers for CVE-2026-24733

vendor priority summary link
debian not yet assigned CVE-2026-24733 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-2026-24733
redhat low — https://access.redhat.com/security/cve/CVE-2026-24733
suse medium CVE-2026-24733 severity moderate: SUSE including 120 source package names (13.2-9.10:gpg2-2.4.4-5.1, 2.1.3-6.51:gpg2-2.4.4-5.1, …), 411 product×package rows across 50 product lines (Container suse/manager/5.0/x86_64/server, Container suse/sl-micro/6.0/baremetal-os-container, … (50 product lines)): Fixed 378, First Fixed 33. https://www.suse.com/security/cve/CVE-2026-24733/
ubuntu medium CVE-2026-24733 medium priority: Ubuntu including 6 source packages (tomcat10, tomcat11, tomcat6, tomcat7, tomcat8, tomcat9), 37 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needs-triage 18, DNE 16, ignored 3. https://ubuntu.com/security/CVE-2026-24733

Affected software / configurations for CVE-2026-24733

Vendor Product Version Raw CPE
apache tomcat >= 9.0.1, < 9.0.113 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 10.1.1, < 10.1.50 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 11.0.1, < 11.0.15 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone16:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone17:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone18:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone19:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone2:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone20:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone22:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone23:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone24:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone25:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone26:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone27:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone3:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone4:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone5:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone6:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone7:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone8:*:*:*:*:*:*
apache tomcat 9.0.0 cpe:2.3:a:apache:tomcat:9.0.0:milestone9:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone1:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone10:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone2:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone3:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone4:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone5:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone6:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone7:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone8:*:*:*:*:*:*
apache tomcat 10.0.0 cpe:2.3:a:apache:tomcat:10.0.0:milestone9:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone1:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone10:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone11:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone12:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone13:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone14:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone15:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone16:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone17:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone18:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone19:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone2:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone20:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone21:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone22:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone23:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone24:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone25:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone26:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone3:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone4:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone5:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone6:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone7:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone8:*:*:*:*:*:*
apache tomcat 11.0.0 cpe:2.3:a:apache:tomcat:11.0.0:milestone9:*:*:*:*:*:*

References for CVE-2026-24733

cvelogic Threat Intelligence