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Apache Traffic Server EUVDEUVD-2026-50220

| CVE-2026-58164 HIGH
Use After Free (CWE-416)
2026-07-29 apache GHSA-wf7j-7jm8-xrmj
Use After Free Memory Corruption Apache Information Disclosure 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:L/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
7.0 HIGH

Network-reachable and unauthenticated (AV:N/PR:N/UI:N), but the TOCTOU race window makes exploitation high-complexity (AC:H); impact is availability-heavy with only low C/I from freed-memory access.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/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:L/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

7
Analysis Updated
Jul 29, 2026 - 10:46 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 29, 2026 - 10:45 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) 8.3 (HIGH)
Analysis Generated
Jul 29, 2026 - 09:58 vuln.today
CVE Published
Jul 29, 2026 - 08:37 cve.org
MEDIUM 7.5

DescriptionCVE.org

Apache Traffic Server has use-after-free and time-of-check/time-of-use errors in remap configuration handling.

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

Memory corruption in Apache Traffic Server's remap configuration handling lets remote attackers trigger a use-after-free and time-of-check/time-of-use race, primarily crashing the proxy (high availability impact) with secondary low-level confidentiality and integrity exposure. It affects the 8.x, 9.x, and 10.x branches up to 8.1.9, 9.2.14, and 10.1.3, and is fixed in 9.2.15 and 10.1.4. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed ATS proxy over network
Delivery
Send crafted requests during remap processing
Exploit
Race TOCTOU window in remap config handling
Execution
Access freed object (use-after-free)
Persist
Crash worker or corrupt state
Impact
Denial of service on edge/CDN node
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Vulnerability AssessmentAI

Exploitation Exploitation targets Apache Traffic Server's remap configuration handling (remap.config rule processing) and requires triggering the use-after-free / TOCTOU race - the CVSS 4.0 AT:P bit signals that a non-trivial attack requirement (winning the timing window between the check and the use, typically during concurrent remap processing or config reload) must be satisfied. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are moderate-to-high but not maximal. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network reach to the proxy sends a stream of crafted requests timed to coincide with remap rule processing or a configuration reload, aiming to hit the check-then-use window and access memory freed by a concurrent operation. Success crashes the affected worker (denial of service) and may leak or corrupt small amounts of adjacent state; reliability is limited because the attacker must repeatedly race the timing window. …
Remediation Vendor-released patch: upgrade to 9.2.15 (for the 8.x and 9.x lines) or 10.1.4 (for the 10.x line), as directed 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, inventory all systems running Apache Traffic Server to identify deployments on affected versions (8.x, 9.x up to 9.2.14, and 10.x up to 10.1.3). …

Sign in for detailed remediation steps and compensating controls.

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

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Same weakness CWE-416 – Use After Free

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CVE-2013-2551 HIGH POC
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Same technique Use After Free

View all
CVE-2015-5119 CRITICAL POC
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CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8
CVE-2012-4969 HIGH POC
8.1

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EUVD-2026-50220 vulnerability details – vuln.today
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