Medium severity · published Jul 29, 2026
CVE-2026-58156
Apache Traffic Server: URL and port parsing errors allow access-control bypass
4.9
CVSS
0.4%
EPSS
No
On KEV
Description
Apache Traffic Server mis-parses ports in URLs and userinfo, allowing port-based access-control 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 vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AT
Apache Traffic Server · Apache Software Foundation
8.0.0 through 8.1.11; 9.0.0 through 9.2.14; 10.0.0 through 10.1.3 · source: vendor
TS
Traffic Server · Apache
8.0.0 through 8.1.9; 9.0.0 before 9.2.15; 10.0.0 before 10.1.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58156
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-58156
vendor-advisory
https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d
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