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Apache Traffic Server EUVDEUVD-2026-50223

| CVE-2026-58178 HIGH
Uncontrolled Recursion (CWE-674)
2026-07-29 apache GHSA-jmf6-wg5m-793g
Apache Information Disclosure 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 and unauthenticated (AV:N/PR:N) but requires the optional ESI plugin enabled and attacker-influenced markup, so AC:H; impact is availability-only (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 - 10:41 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 - 09:57 vuln.today
CVE Published
Jul 29, 2026 - 08:43 cve.org
MEDIUM 7.5

DescriptionCVE.org

The Apache Traffic Server ESI plugin can recurse without bound and fetch attacker-controlled URLs.

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 the Apache Traffic Server ESI (Edge Side Includes) plugin allows remote unauthenticated attackers to trigger unbounded recursion while the plugin fetches attacker-controlled URLs, exhausting server resources. It affects Apache Traffic Server 8.0.0 through 8.1.9, 9.0.0 through 9.2.14, and 10.0.0 through 10.1.3 when the ESI plugin is enabled. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ATS node with ESI enabled
Delivery
Supply crafted nested ESI markup
Exploit
Plugin recurses fetching attacker URLs
Execution
Unbounded recursion and repeated fetches
Impact
Resource exhaustion denies service
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the Apache Traffic Server deployment has the ESI plugin enabled and processing responses (the plugin is optional and not loaded by default), and that the attacker can influence ESI markup reaching the plugin so that recursive/nested include directives pointing to attacker-controlled URLs are processed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are moderately consistent and point to a real but bounded risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can cause the ESI plugin to process crafted ESI markup - for example by controlling or poisoning an origin response, or by injecting nested include directives - submits content that references further includes recursively. The ESI plugin follows these without a depth limit, recursing and repeatedly fetching attacker-controlled URLs until CPU, memory, or connection resources on the Traffic Server node are exhausted, degrading or denying service for legitimate clients. …
Remediation Vendor-released patch: upgrade Apache Traffic Server to 9.2.15 or 10.1.4, which fix the unbounded recursion in the ESI plugin, as documented in 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 all systems running Apache Traffic Server versions 8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3 with the ESI plugin enabled and assess criticality; if ESI is not business-essential, disable it immediately. …

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EUVD-2026-50223 vulnerability details – vuln.today
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