EUVD-2026-50210
GHSA-vc32-c93g-p2f6
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/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
Remote unauthenticated (PR:N) but timing-dependent session reuse gives AC:H; cross-connection data leak is scope-changed and confidentiality-critical (C:H), with only incidental integrity (I:L) and no availability impact.
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:N/SC:L/SI:H/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
Lifecycle Timeline
4DescriptionCVE.org
Apache Traffic Server can reuse server sessions and tunnels improperly, exposing data across client connections.
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
Cross-connection information disclosure in Apache Traffic Server (versions 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) allows remote unauthenticated attackers to receive data belonging to other clients because the proxy improperly reuses upstream server sessions and tunnels. Because the scope changes across trust boundaries, one client can be served another client's response data, making this a confidentiality-critical issue in a shared caching/proxy tier. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that ATS be configured to reuse/share persistent origin server sessions and tunnels across client connections (its performance-oriented keep-alive/session-pooling behavior) and that the proxy be concurrently serving multiple clients whose data can cross over. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderately-to-highly concerning but not maximal. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends normal HTTP(S) requests through an ATS proxy that simultaneously serves many other clients; by driving concurrent connections and exploiting the flawed session/tunnel reuse, the attacker occasionally receives a response (or tunnel data) intended for a different client, harvesting another user's sensitive content such as authenticated pages or tokens. Because exploitation depends on session-pool timing (CVSS AC:H) and no POC is published, an attacker would likely need repeated attempts and favorable load conditions rather than a single deterministic request. |
| 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 published in the Apache advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of infrastructure to identify all Apache Traffic Server deployments and confirm whether any instance runs versions 8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3. …
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
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External POC / Exploit Code
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