TI-2026-54150 Aliases CVE-2026-77756 GHSA-gpfr-7w77-mp48

Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests

LOW 18CWE-444Published 2026-09-23 · Updated 2026-09-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: Partial Red Hat: 1 fixed, 8 without a fix

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

Summary

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. 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 0.00526 44th percentileScored 2026-11-07

Fix Partial Red Hat: 2 advisoriesRed Hat: 1 fixed, 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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	11.0.0-M1 – 11.0.25; 10.1.0-M1 – 10.1.59; 9.0.47 – 9.0.121; 8.5.67 – 8.5.100	—	Patch available	CNA

Apache Tomcat VendorApache Affected 11.0.0-M1 – 11.0.25; 10.1.0-M1 – 10.1.59; 9.0.47 – 9.0.121; 8.5.67 – 8.5.100 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 5	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: 2 products

Red Hat Enterprise Linux 8
Red Hat Hardened Images

Timeline

2026-10-02 Threatist record created from CVE-2026-77756
2026-10-03 Alias added: GHSA-gpfr-7w77-mp48
2026-10-08 Affected versions changed · Red Hat

References

Advisory 1

https://lists.apache.org/thread/bl5b6rxqh3vb2k9bj2794vhor7o6xl3z

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