CVE-2026-33930

published 2026-07-29

CVE-2026-33930: Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header…

Priority P3 36 medium 5.9 CVSS 3.1

AV N AC H PR N UI N S U C N I N A H

Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled.

This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.

Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
apache	traffic_server	>= 10.0.0 < 10.1.4	10.1.4
apache	traffic_server	8.0.0 – 8.1.9	—
apache	traffic_server	>= 9.0.0 < 9.2.15	9.2.15
apache_software_foundation	apache_traffic_server	10.0.0 – 10.1.3	—
apache_software_foundation	apache_traffic_server	8.0.0 – 8.1.11	—
apache_software_foundation	apache_traffic_server	9.0.0 – 9.2.14	—

CVSS provenance

nvd v3.1 5.9 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd v4.0 8.2 HIGH CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-121