Paper/Archive/CVE-2026-111809

CVE-2026-111809

Apache Software Foundation Apache Traffic Server — Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable request smuggling

EPSS 0.2%CVSS 9.3

critical.is priorityof 100

CVSS 9.3 (CNA)9.3 / 10 × 3027.9 Not in CISA KEV+300.0 EPSS percentile 12.3.123 × 202.5 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding. 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.

Affected

ProductAffectedFixed inSource

Apache Traffic Server8.0.0 – 8.1.11–CNA

Apache Traffic Server9.0.0 – 9.2.15–CNA

Apache Traffic Server10.0.0 – 10.1.4–CNA

Apache Traffic Server10.2.0–CNA

Scores by source

apache (CNA)9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

apache (CNA)6.9CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

advisorylists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc