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Apache Traffic Server EUVDEUVD-2026-50227

| CVE-2026-58182 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-07-29 apache GHSA-x56q-2cqh-7326
Denial Of Service Apache 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

Remote and unauthenticated (AV:N/PR:N) but the AT:P precondition and ts_lua-only exposure map to AC:H; impact is availability-only (A:H, C/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 - 10:36 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
8.6 (MEDIUM) 8.2 (HIGH)
Analysis Generated
Jul 29, 2026 - 09:55 vuln.today
CVE Published
Jul 29, 2026 - 08:54 cve.org
MEDIUM 8.6

DescriptionCVE.org

The Apache Traffic Server ts_lua plugin mishandles initialization, transform context, and per-instance state.

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 the ts_lua plugin mishandling initialization, transform context, and per-instance state, allowing remote unauthenticated attackers to exhaust or corrupt resource state and crash or hang the proxy (CVSS 4.0 base 8.2, availability-only impact). Exploitation carries an attack requirement (AT:P), meaning a specific condition beyond the attacker's control must hold, and only deployments that actually load the ts_lua scripting plugin are affected. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ts_lua-enabled ATS proxy
Delivery
Send crafted HTTP requests
Exploit
Trigger mishandled transform/per-instance state
Execution
Drive uncontrolled resource consumption
Impact
Crash or hang proxy (DoS)
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Apache Traffic Server instance has the ts_lua plugin loaded and active (configured via plugin.config or per-remap in remap.config) - proxies without ts_lua are not affected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are internally consistent but point to a moderate, not top-tier, real-world priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can send HTTP requests to an internet-facing ATS proxy that has the ts_lua plugin enabled repeatedly triggers the mishandled transform/per-instance state path, causing the proxy to leak or exhaust resources until it crashes or stops serving traffic. Because the CVSS attack requirement is Present (AT:P), the attacker needs the right condition to be met - such as a specific ts_lua hook or transform being configured - rather than any arbitrary request. …
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; note that the 8.x line (8.0.0-8.1.9) is listed as affected but no fixed 8.x release is named, so 8.x operators should plan a migration to a patched 9.2.15+ or 10.1.4+ release. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Apache Traffic Server instances running versions 8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3 and determine which have the ts_lua plugin enabled; disable the ts_lua module where operationally feasible to eliminate the attack surface. …

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EUVD-2026-50227 vulnerability details – vuln.today
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