Critical 9.3Published Jul 29, 2026

CVE-2026-58155Apache Traffic Server: Header-name length truncation enables header aliasing and request smuggling

Updated under an hour ago (Oct 26, 2026, 5:40 PM ET)

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It affects Apache Software Foundation Apache Traffic Server and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for Apache Software Foundation Apache Traffic Server

Exploited in the last 30 days

Apache Traffic Server truncates over-long header names, allowing header aliasing, request smuggling, and policy bypass. 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.

CVSS: 9.3 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
Weakness (CWE): CWE-444
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Modified
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache Traffic Server apache_software_foundation:apache_traffic_server (from the name)	from 8.0.0 through 8.1.11; from 9.0.0 through 9.2.14; from 10.0.0 through 10.1.3	CNA record
apache traffic_server apache:traffic_server	from 8.0.0 through 8.1.9; from 9.0.0 before 9.2.15; from 10.0.0 before 10.1.4	NVD

References

References

https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d	vendor-advisory, mailing-list

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.