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Apache Traffic Server CVE-2026-58184

| EUVDEUVD-2026-50229 HIGH
Out-of-bounds Write (CWE-787)
2026-07-29 apache GHSA-m68v-95hx-r5c3
Buffer Overflow Memory Corruption Apache Apache Traffic Server
8.3
CVSS 4.0 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
8.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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
6.5 MEDIUM

Network-reachable and unauthenticated (AV:N/PR:N), but requires a specific header_rewrite cookie/CIDR configuration (AC:H); impact is mainly a crash (A:H) with limited memory exposure (C:L).

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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:L/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 - 10:33 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
8.2 (MEDIUM) 8.3 (HIGH)
Analysis Generated
Jul 29, 2026 - 09:55 vuln.today
CVE Published
Jul 29, 2026 - 08:56 cve.org
MEDIUM 8.2

DescriptionCVE.org

The Apache Traffic Server header_rewrite plugin can crash or corrupt memory during cookie operations and CIDR condition matching.

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

Out-of-bounds memory write in the Apache Traffic Server header_rewrite plugin allows remote attackers to crash the proxy or corrupt memory by triggering the plugin's cookie-manipulation and CIDR condition-matching logic. The flaw affects ATS 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3, and is reachable over the network without authentication (PR:N) when a vulnerable header_rewrite ruleset is deployed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ATS with header_rewrite enabled
Delivery
Send crafted Cookie/CIDR-triggering request
Exploit
Trigger out-of-bounds write in plugin
Execution
Corrupt memory or crash proxy
Impact
Denial of service on edge tier
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Apache Traffic Server has the header_rewrite plugin loaded AND configured with either cookie operations or CIDR condition matching - this is the concrete prerequisite encoded by the CVSS 4.0 AT:P (Attack Requirement Present) bit and stated in the description. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS 4.0 score is 8.3 (High) with vector AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H - network-reachable, unauthenticated, low complexity, but with an explicit Attack Requirement (AT:P) and impact dominated by availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends crafted HTTP requests with malformed or oversized Cookie headers (or from source IPs designed to exercise CIDR matching) to an ATS instance whose header_rewrite ruleset performs cookie operations or CIDR condition checks, driving the plugin to write out of bounds and crash the proxy, causing a denial of service for all traffic behind it. Because the vector is network and unauthenticated (PR:N/UI:N), repeated requests can keep the edge tier offline. …
Remediation Vendor-released patch: upgrade to Apache Traffic Server 9.2.15 (for 8.x and 9.x lines) or 10.1.4 (for 10.x), which fix the issue per the Apache advisory (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: Inventory 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 header_rewrite plugin enabled, document network-facing exposure, and alert incident response teams. …

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Same weakness CWE-787 – Out-of-bounds Write

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Same technique Buffer Overflow

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CVE-2026-58184 vulnerability details – vuln.today
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