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Apache Traffic Server EUVDEUVD-2026-50171

| CVE-2026-33930 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-07-29 apache GHSA-4p58-9v5g-254v
Buffer Overflow Apache Stack Overflow Apache Traffic Server
8.2
CVSS 4.0 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
8.2 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/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
5.9 MEDIUM

Network and unauthenticated (AV:N/PR:N), but AC:H reflects the required non-default redirect-following configuration (AT:P); impact is availability-only DoS per vendor, so C:N/I:N/A:H.

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

6
Analysis Updated
Jul 29, 2026 - 08:31 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 29, 2026 - 08:22 vuln.today
cvss_changed
Severity Changed
Jul 29, 2026 - 08:22 NVD
MEDIUM HIGH
CVSS changed
Jul 29, 2026 - 08:22 NVD
5.9 (MEDIUM) 8.2 (HIGH)
Analysis Generated
Jul 29, 2026 - 08:19 vuln.today
CVE Published
Jul 29, 2026 - 07:23 cve.org
MEDIUM 5.9

DescriptionCVE.org

Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled.

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

Denial-of-service (and potential memory corruption) in Apache Traffic Server affects versions 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3 when redirect following is enabled. The proxy copies the client-supplied Host header into a fixed-size stack buffer without bounds checking during redirect handling, so an over-long Host header overflows the stack and crashes the process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ATS proxy over network
Delivery
Send request with over-long Host header
Exploit
Redirect handling copies header to stack buffer
Execution
Overflow fixed-size stack buffer
Impact
Crash Traffic Server process (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires that Apache Traffic Server's redirect-following feature is enabled - this is the specific configuration prerequisite (AT:P in the CVSS vector); against a default deployment without redirect following, the vulnerable code path is not reached. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are moderately consistent. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario With redirect following enabled, a remote unauthenticated attacker sends an HTTP request carrying an abnormally long Host header to the ATS proxy; during redirect handling the header is copied into an undersized stack buffer, corrupting the stack and crashing the server process, causing denial of service to all clients behind that node. No public exploit code is currently identified, and low attack complexity means the crash is straightforward to trigger once the required configuration is present.
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 and inventory all Apache Traffic Server deployments and confirm which instances run vulnerable versions (8.0.0-8.1.9, 9.0.0-9.2.14, 10.0.0-10.1.3) and whether redirect following is enabled. …

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EUVD-2026-50171 vulnerability details – vuln.today
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