TI-2026-54537 Aliases CVE-2026-78437 GHSA-hvg5-8g86-xm44

Apache Tomcat: HTTP/2 DoS via malformed request

LOW 39CWE-459Published 2026-09-23 · Updated 2026-09-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Partial Red Hat: 1 fixed, 7 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00511 43rd percentileScored 2026-11-07

Fix Partial Red Hat: 2 advisoriesRed Hat: 1 fixed, 7 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apache	Apache Tomcat	11.0.19 – 11.0.25; 10.1.53 – 10.1.59; 9.0.116 – 9.0.121	—	Patch available	CNA

Apache Tomcat VendorApache Affected 11.0.19 – 11.0.25; 10.1.53 – 10.1.59; 9.0.116 – 9.0.121 Fixed in — Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:apache:tomcat::::::::	—	—	Apache

cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions — — ·Apache

Remediation

Red Hat 2 advisories

RHSA-2026:68258 Released 2026-09-16 · Red Hat rating Important
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images tomcat11-1:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat11-1:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat11-1:11.0.26-0.1.hum1@src +18
RHSA-2026:68257 Released 2026-09-16 · Red Hat rating Important
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images tomcat10-1:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat10-1:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat10-1:10.1.60-0.1.hum1@src +18

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat JBoss Web Server 6	Affected	No fix yet
Red Hat JBoss Web Server 7	Affected	No fix yet
Red Hat Hardened Images	Fixed	RHSA-2026:68257, RHSA-2026:68258

Not affected: 5 products

Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Hardened Images
Red Hat JBoss Web Server 5

Timeline

2026-10-02 Threatist record created from CVE-2026-78437
2026-10-03 Alias added: GHSA-hvg5-8g86-xm44
2026-10-08 Affected versions changed · Red Hat

References

Advisory 1

https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg

TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
TI-2024-30292 Apache OFBiz: Confused controller-view authorization logic (forced browsing) KEVCVSS 3.1CRITICAL 9.8
TI-2024-26062 Apache OFBiz: Unauthenticated endpoint could allow execution of screen rendering code KEVCVSS 3.1CRITICAL 9.8
TI-2024-21190 Apache OFBiz: Path traversal leading to RCE KEVCVSS 3.1CRITICAL 9.8
TI-2024-18186 Apache HugeGraph-Server: Command execution in gremlin KEVCVSS 3.1CRITICAL 9.8
TI-2023-25106 Deserialization of untrusted data in Apache ActiveMQ KEVCVSS 3.1CRITICAL 10.0

See all 4053 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences