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Apache Traffic Server EUVDEUVD-2026-50173

| CVE-2026-58150 HIGH
HTTP Request/Response Smuggling (CWE-444)
2026-07-29 apache GHSA-5cvm-p8jm-mcrf
Apache Request Smuggling Information Disclosure Apache Traffic Server
7.8
CVSS 4.0 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.8 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/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
9.3 CRITICAL

Network-reachable, unauthenticated, low-complexity smuggling with scope change to the backend; integrity high (injected requests) and confidentiality low (leaked/hijacked responses), no availability impact.

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

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/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

5
Analysis Updated
Jul 29, 2026 - 08:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 29, 2026 - 08:22 vuln.today
cvss_changed
CVSS changed
Jul 29, 2026 - 08:22 NVD
10.0 (HIGH) 7.8 (HIGH)
Analysis Generated
Jul 29, 2026 - 08:16 vuln.today
CVE Published
Jul 29, 2026 - 07:30 cve.org
HIGH 10.0

DescriptionCVE.org

Apache Traffic Server does not reject Transfer-Encoding in HTTP/2 requests, allowing downgrade request smuggling.

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

HTTP request smuggling in Apache Traffic Server (versions 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) lets remote attackers desynchronize proxy/backend request parsing because the server fails to reject the Transfer-Encoding header on inbound HTTP/2 requests. When ATS downgrades those HTTP/2 requests to HTTP/1.1 for origin servers, the improper Transfer-Encoding directive creates a parsing discrepancy that enables downgrade request smuggling. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach HTTP/2-enabled ATS proxy
Delivery
Send HTTP/2 request with Transfer-Encoding header
Exploit
ATS fails to reject header
Execution
Downgrade to HTTP/1.1 desyncs backend
Persist
Inject smuggled request to origin
Impact
Poison cache or hijack requests
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Vulnerability AssessmentAI

Exploitation The specific prerequisite is that Apache Traffic Server must accept inbound HTTP/2 client connections and proxy to an HTTP/1.1 backend (the downgrade path), because the smuggling arises when ATS translates an HTTP/2 request carrying a Transfer-Encoding header into HTTP/1.1. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N, base 7.8/High) indicates network-reachable, low-complexity, unauthenticated exploitation with no user interaction - consistent with an internet-facing proxy. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a crafted HTTP/2 request to an internet-facing ATS reverse proxy that includes a Transfer-Encoding: chunked header; ATS accepts it and downgrades the request to HTTP/1.1 toward the backend, which now interprets the message boundaries differently and treats attacker-controlled trailing bytes as the start of a new, injected request. This lets the attacker poison the shared cache, hijack or redirect another user's in-flight request, or bypass front-end access controls. …
Remediation Vendor-released patch: upgrade to Apache Traffic Server 9.2.15 (for the 9.x line) or 10.1.4 (for the 10.x line) per the Apache advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all systems running Apache Traffic Server versions 8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3 and assess their exposure level. …

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EUVD-2026-50173 vulnerability details – vuln.today
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