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Apache Traffic Server CVE-2026-58153

| EUVDEUVD-2026-50205 MEDIUM
HTTP Request/Response Smuggling (CWE-444)
2026-07-29 apache GHSA-crqg-wq4g-597m
Apache Request Smuggling Information Disclosure 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:N/VA:N/SC:N/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
8.3 HIGH

Network-accessible proxy requires no auth; scope changes because HTTP/1 downstream clients - not ATS - bear the response injection impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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:N/VA:N/SC:N/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
8.3 (MEDIUM) 6.3 (MEDIUM)
Analysis Generated
Jul 29, 2026 - 08:53 vuln.today
CVE Published
Jul 29, 2026 - 08:17 cve.org
MEDIUM 8.3

DescriptionCVE.org

Apache Traffic Server forwards HTTP/2 origin trailers to HTTP/1 clients without proper chunked framing when converting HTTP/2 to HTTP/1.

This issue affects Apache Traffic Server: 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/2-to-HTTP/1 protocol conversion in Apache Traffic Server 10.0.0-10.1.3 forwards origin HTTP/2 trailers to downstream HTTP/1 clients without the required chunked transfer encoding framing, enabling HTTP response smuggling. The CVSS 8.3 Scope:Changed rating reflects that exploitation impacts downstream HTTP/1 clients architecturally separate from ATS itself, with potential for cache poisoning, response injection, and limited information disclosure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify ATS reverse proxy serving HTTP/1 clients from HTTP/2 origins
Delivery
Craft HTTP/2 origin response containing malicious trailer fields
Exploit
ATS forwards trailers without chunked encoding framing
Execution
HTTP/1 downstream client misparses response boundary
Persist
Attacker-controlled data interpreted as new HTTP response
Impact
Cache poisoned or subsequent client request hijacked
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Vulnerability AssessmentAI

Exploitation Exploitation requires Apache Traffic Server to be deployed as a reverse proxy where the origin-facing connection uses HTTP/2 and the client-facing connection uses HTTP/1.1 - the specific mixed-protocol topology that triggers the vulnerable conversion path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.3 score is driven by the S:C (Scope Changed) designation, which is well-justified - downstream HTTP/1 clients are distinct from ATS itself and bear the impact of response injection. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who controls or can influence an HTTP/2 origin server response sends a reply containing HTTP/2 trailers with crafted content. ATS forwards those trailers to a downstream HTTP/1 client without proper chunked framing, causing the client to misinterpret the response boundary and treat the trailer data as the beginning of a subsequent HTTP response. …
Remediation Upgrade Apache Traffic Server to version 10.1.4 (for 10.x branch) or 9.2.15 (for 9.x branch), as confirmed by the Apache vendor advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report.
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Out-of-bounds memory write in the Apache Traffic Server header_rewrite plugin allows remote attackers to crash the proxy
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Denial of service in Apache Traffic Server (versions 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) arises from a stack-b
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Denial of service in the Apache Traffic Server ESI (Edge Side Includes) plugin allows remote unauthenticated attackers t

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CVE-2026-58153 vulnerability details – vuln.today
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