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Apache Traffic Server EUVDEUVD-2026-50185

| CVE-2026-58156 MEDIUM
Incorrect Authorization (CWE-863)
2026-07-29 apache GHSA-r6wf-4rwv-gf97
Apache Authentication Bypass Apache Traffic Server
6.3
CVSS 4.0 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/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
vuln.today AI
4.9 MEDIUM

Network-exploitable URL parsing bypass requiring authenticated proxy access (PR:L) and specific URL crafting (AC:H); Changed scope (S:C) reflects proxy-to-backend boundary crossing with no availability impact.

3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
CVSS changed
Jul 29, 2026 - 09:22 NVD
4.9 (MEDIUM) 6.3 (MEDIUM)
Analysis Generated
Jul 29, 2026 - 08:53 vuln.today
CVE Published
Jul 29, 2026 - 08:25 cve.org
MEDIUM 4.9

DescriptionCVE.org

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 8.1.9, 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.

AnalysisAI

Port-based access-control bypass in Apache Traffic Server stems from URL and userinfo mis-parsing that causes the proxy to evaluate ACL rules against an incorrect port value, allowing restricted backend ports to be reached. All three maintained release branches are affected - 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3 - meaning the majority of deployed ATS instances are vulnerable. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Authenticate to ATS proxy with low-privilege credentials
Delivery
Craft URL with malformed port in userinfo or authority component
Exploit
Submit request to ATS
Install
ATS mis-parses port value in ACL evaluation
C2
Port-based ACL incorrectly permits request
Execute
ATS forwards request to restricted backend port
Impact
Attacker receives response from otherwise-blocked service
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Vulnerability AssessmentAI

Exploitation Exploitation requires network access to an Apache Traffic Server instance with at least low-privilege authenticated access (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 4.9 (Medium) with vector AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N accurately represents a nuanced threat profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with low-privilege access to an ATS proxy instance crafts a request URI containing a malformed port value embedded in the userinfo component or host:port field - for example, encoding a target port in a way that ATS's parser interprets differently from the ACL engine. ATS evaluates the ACL against the mis-parsed (and permitted) port, forwards the request to the actual restricted backend port, and returns the response to the attacker. …
Remediation Upgrade to Apache Traffic Server 9.2.15 or 10.1.4, the vendor-confirmed fixed releases per the advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-50185 vulnerability details – vuln.today
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