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Apache Traffic Server CVE-2026-33267

| EUVDEUVD-2026-50169 HIGH
Improper Input Validation (CWE-20)
2026-07-29 apache GHSA-jrh6-9hgv-mqm7
Apache Information Disclosure Apache Traffic Server
7.7
CVSS 4.0 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/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
8.6 HIGH

Network-reachable, low-complexity, unauthenticated with no UI; impact is integrity of a separate downstream system (scope change S:C, I:H), with no confidentiality or availability effect.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/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:N/VA:N/SC:N/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 - 08:32 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) 7.7 (HIGH)
Analysis Generated
Jul 29, 2026 - 08:16 vuln.today
CVE Published
Jul 29, 2026 - 07:21 cve.org
HIGH 10.0

DescriptionCVE.org

Improper Input Validation vulnerability in Apache Traffic Server.

This issue affects Apache Traffic Server: from 9.2.0 through 9.2.14, from 10.1.0 through 10.1.3.

Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue.

AnalysisAI

Improper input validation in Apache Traffic Server versions 9.2.0-9.2.14 and 10.1.0-10.1.3 lets remote attackers send malformed input that the proxy fails to validate, allowing manipulation of the integrity of downstream/backend traffic (e.g. request smuggling or response manipulation against systems behind the proxy). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach internet-facing ATS proxy
Delivery
Send crafted malformed HTTP request
Exploit
Bypass improper input validation
Execution
Desynchronize proxy/backend parsing
Impact
Manipulate or smuggle downstream traffic
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Vulnerability AssessmentAI

Exploitation Exploitation requires network reach to an affected Apache Traffic Server instance (9.2.0-9.2.14 or 10.1.0-10.1.3) operating in its proxy role, and the ability to send crafted/malformed HTTP input that triggers the improper validation; per CVSS 4.0 (AV:N/AC:L/AT:N/PR:N/UI:N) no authentication, no special attack requirements, and no user interaction are needed against a reachable instance. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are moderately consistent but incomplete. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a crafted HTTP request with malformed or ambiguous framing/headers to an internet-facing Apache Traffic Server proxy on an affected version. Because ATS improperly validates the input, the request is relayed to a backend in a way the backend interprets differently, letting the attacker manipulate or poison downstream traffic (e.g. …
Remediation Vendor-released patch: upgrade to Apache Traffic Server 9.2.15 (for the 9.2.x branch) or 10.1.4 (for the 10.1.x branch), 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, conduct a complete inventory of all Apache Traffic Server instances running the affected versions (9.2.0-9.2.14 and 10.1.0-10.1.3) and document their production criticality. …

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CVE-2026-33267 vulnerability details – vuln.today
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