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Apache Traffic Server EUVDEUVD-2026-50221

| CVE-2026-58175 HIGH
Memory Leak (CWE-401)
2026-07-29 apache GHSA-5956-65wj-chxh
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:L/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, but the SRV-through-HostDB precondition and cumulative triggering map to AC:H; impact is availability-only (A:H), with no confidentiality or integrity effect.

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:L/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 - 10:45 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 29, 2026 - 10:44 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 - 08:41 cve.org
MEDIUM 7.5

DescriptionCVE.org

Apache Traffic Server leaks memory when handling HostDB SRV records.

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 a memory leak in the HostDB code path that processes DNS SRV records, allowing remote attackers to progressively exhaust proxy memory and degrade or crash the service. The CVSS 4.0 vector (8.2, VA:H) points to an availability impact rather than the information disclosure implied by the vendor tag. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ATS resolver over network
Delivery
Induce SRV record resolution via HostDB
Exploit
Trigger unfreed memory allocation
Execution
Repeat to accumulate leak
Persist
Exhaust proxy memory
Impact
Crash service / deny availability
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Vulnerability AssessmentAI

Exploitation Exploitation requires that Apache Traffic Server actually process DNS SRV records through its HostDB host-resolution cache - i.e., the deployment must use upstream/origin resolution that returns and consumes SRV records; a configuration that never resolves SRV records will not exercise the leaking code path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-supplied CVSS 4.0 score is 8.2 (High) with vector AV:N/AC:L/AT:P/PR:N/UI:N and a pure availability impact (VA:H, SA:L; VC/VI = N), meaning network-reachable and unauthenticated but gated by an attack requirement (AT:P) - the leak only triggers under the specific condition that SRV records flow through HostDB, which depends on upstream DNS/service configuration. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can influence the DNS responses ATS resolves - for example by controlling or spoofing SRV records returned for an upstream/origin lookup - repeatedly drives SRV-record processing through HostDB, causing memory to leak on each cycle. Over time the proxy's memory footprint grows until it is exhausted, degrading throughput and ultimately crashing the service and denying availability to all clients behind it. …
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) as the primary fix, per 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 Apache Traffic Server deployments and identify which versions run in production systems. …

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EUVD-2026-50221 vulnerability details – vuln.today
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