Read the docs
TI-2025-43961 Aliases CVE-2025-55702GHSA-5vqp-jf47-frjg

HTTP request smuggling in Apache Traffic Server

Priority LOW 33CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Apache Traffic Server from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, and from 10.2.0 is affected. When an origin answers a POST with Expect: 100-continue before reading the body, the unread body stays on the client connection and is parsed as the next request (CWE-444). A remote, unauthenticated attacker behind a front-end proxy that shares connections with Traffic Server can smuggle requests past the front end and desynchronize responses for other users.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

When a client sends a POST with Expect: 100-continue and the origin answers before reading the body, Apache Traffic Server parses the unread body left on the client connection as the next request. An attacker behind a front-end proxy that shares connections to Traffic Server can use this to smuggle requests past the front end and desynchronize responses for other users. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00325 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Traffic Server8.0.0 – 8.1.11; 9.0.0 – 9.2.15; 10.0.0 – 10.1.4; 10.2.0—No fix listedCNA
  • Apache Traffic Server VendorApache Affected 8.0.0 – 8.1.11; 9.0.0 – 9.2.15; 10.0.0 – 10.1.4; 10.2.0 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

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

CPEVersionsRoleVendor
cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*——Apache
  • cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:* Versions — — ·Apache

Remediation

Upgrade to Apache Traffic Server 9.2.16, 10.1.5, or 10.2.1, which fix the issue. The sources list no fixed version for Apache Traffic Server 8.x.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Apache Traffic Server — lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc

    15 records Highest priority Priority MEDIUM 10 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2026-78953 Argument injection in Apache Traffic Server magick pluginPriority MEDIUM 49
    • TI-2026-78957 Malformed 302 responses bypass rejection in Apache Traffic ServerPriority MEDIUM 45
    • TI-2026-78964 Unthrottled logging in Apache Traffic Server allows log-flood DoSPriority MEDIUM 44
    Show all 15 records → Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-21 Threatist record created from CVE-2025-55702
  2. 2026-10-21 Alias added: GHSA-5vqp-jf47-frjg
  3. 2026-10-23 CISA SSVC decision points changed
  4. 2026-10-23 Priority changed: MEDIUM → LOW
  5. 2026-10-23 CISA SSVC decision points changed
  6. 2026-10-29 Affected versions changed · Red Hat
  7. 2026-10-29 CVSS score added · Red Hat

References

Advisory 1

  • 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