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Apache Traffic Server CVE-2026-58183

| EUVDEUVD-2026-50228 HIGH
Improper Input Validation (CWE-20)
2026-07-29 apache GHSA-5gc7-q59c-j3fj
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 unauthenticated DoS, but the optional prefetch plugin must be enabled to reach the code path (an attack requirement), so AC:H; availability-only impact gives A:H with 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 - 10:35 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
5.9 (MEDIUM) 8.2 (HIGH)
Analysis Generated
Jul 29, 2026 - 09:55 vuln.today
CVE Published
Jul 29, 2026 - 08:55 cve.org
MEDIUM 5.9

DescriptionCVE.org

The Apache Traffic Server prefetch plugin can crash when processing attacker-influenced 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's prefetch plugin allows remote attackers to crash the caching proxy by supplying malicious input that the plugin fails to validate. Affected releases span the 8.x (8.0.0-8.1.9), 9.x (9.0.0-9.2.14), and 10.x (10.0.0-10.1.3) branches, and exploitation impacts only availability with no data exposure or code execution. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ATS with prefetch plugin enabled
Delivery
Send crafted request with malicious input
Exploit
Prefetch plugin fails input validation (CWE-20)
Execution
Process crashes
Impact
Service denial to legitimate clients
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Apache Traffic Server has the prefetch plugin loaded and processing requests - this is the concrete prerequisite reflected by the CVSS 4.0 AT:P (attack requirements present) metric and the description's explicit reference to the prefetch plugin. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are largely consistent and point to a real but availability-only risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends crafted requests to an internet-facing Apache Traffic Server instance that has the prefetch plugin enabled, supplying malformed input the plugin fails to validate. The plugin crashes the ATS process, dropping in-flight connections and denying cache/proxy service to legitimate users. …
Remediation Vendor-released patch: upgrade to Apache Traffic Server 9.2.15 (for the 9.x branch) or 10.1.4 (for the 10.x branch), as directed in the Apache advisory (https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d); note the end-of-life 8.x branch has no fixed release listed, so 8.x users should migrate to a supported patched branch. … 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 and confirm affected versions (8.x through 10.1.3). …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-58183 vulnerability details – vuln.today
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