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Apache Traffic Server EUVDEUVD-2026-50225

| CVE-2026-58180 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-07-29 apache GHSA-jxxq-f4qq-497f
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-reachable with no auth (AV:N/PR:N) but requires the non-default txn_box plugin and specific oversized input (AC:H); impact is availability-only DoS (A:H, C:N/I:N).

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 - 10:39 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 29, 2026 - 10:22 vuln.today
cvss_changed
Severity Changed
Jul 29, 2026 - 10:22 NVD
MEDIUM HIGH
CVSS changed
Jul 29, 2026 - 10:22 NVD
7.5 (MEDIUM) 8.2 (HIGH)
Analysis Generated
Jul 29, 2026 - 09:56 vuln.today
CVE Published
Jul 29, 2026 - 08:45 cve.org
MEDIUM 7.5

DescriptionCVE.org

The Apache Traffic Server txn_box plugin overflows the stack from attacker-controlled input.

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 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-based buffer overflow in the txn_box plugin, which copies attacker-controlled input onto the stack without adequate bounds checking. Remote attackers reaching an ATS instance that loads the txn_box transaction-manipulation plugin can crash the server process; the CVSS 4.0 vector (8.2) scores the impact as availability-only (VA:H) with no confidentiality or integrity loss. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ATS instance running txn_box
Delivery
Send oversized crafted HTTP request
Exploit
Overflow fixed-size stack buffer
Execution
Corrupt stack / return address
Persist
Crash Traffic Server process
Impact
Denial of service to clients
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target Apache Traffic Server to have the experimental txn_box plugin loaded and configured to process transactions - this is the concrete prerequisite, since the overflow lives in that plugin's handling of attacker-controlled request input and default ATS installations do not enable it. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 8.2 (High) reflects AV:N (network), AC:L (low complexity), PR:N (no privileges) and UI:N (no user interaction), but crucially AT:P - a specific attack requirement must be met - and an impact set limited to VA:H with VC:N/VI:N (availability only, no data exposure or code integrity loss). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a crafted HTTP request whose fields exceed the size the txn_box plugin expects, overflowing a fixed-size stack buffer as the plugin processes the transaction. The corrupted stack causes the Traffic Server process to crash, dropping in-flight connections and denying service to legitimate users. …
Remediation Vendor-released patch: upgrade to Apache Traffic Server 9.2.15 or 10.1.4, which fix the overflow; the 8.x line is affected through 8.1.9 with no fixed 8.x release named in the advisory, so 8.x operators should migrate to a patched 9.2.x or 10.1.x build. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, audit your Apache Traffic Server deployment to identify all instances running versions 8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3; cross-reference configuration files to determine which systems have the txn_box plugin loaded. …

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EUVD-2026-50225 vulnerability details – vuln.today
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