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TI-2026-78957 Aliases CVE-2026-111816GHSA-2g9h-67x8-9xr9

Malformed 302 responses bypass rejection in Apache Traffic Server

Priority MEDIUM 45CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · 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 10.2.0 forwards malformed 302 responses that should be rejected as parse errors. The Transfer-Encoding: chunked exception skips that rejection, which is an inconsistent interpretation of HTTP messages (CWE-444). Two peers can read the same response differently, so the proxy stores and serves it, enabling cache poisoning and response-framing desync. A remote attacker needs no privileges or user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

Apache Traffic Server forwarded a malformed 302 response that should have been rejected as a parse error, because the Transfer-Encoding: chunked carve-out bypassed the rejection path. A response that two peers can read differently is then stored and served, allowing cache poisoning and response-framing desync. 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 0.00308 23rd 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
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

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 Apache Traffic Server to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

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-2026-78964 Unthrottled logging in Apache Traffic Server allows log-flood DoSPriority MEDIUM 44
    • TI-2026-78952 Use-after-free in Apache Traffic Server wasm pluginPriority 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-2026-111816
  2. 2026-10-21 Alias added: GHSA-2g9h-67x8-9xr9
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-10-24 CISA SSVC decision points changed
  5. 2026-10-24 Priority changed: LOW → MEDIUM
  6. 2026-11-02 Affected versions changed · Red Hat
  7. 2026-11-02 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