Skip to main content

Apache Traffic Server EUVDEUVD-2026-50212

| CVE-2026-58159 HIGH
Incorrect Authorization (CWE-863)
2026-07-29 apache GHSA-vv89-hv6r-vgqh
Apache Authentication Bypass Apache Traffic Server
7.0
CVSS 4.0 · Vendor: apache
Share

Severity by source

Vendor (apache) PRIMARY
7.0 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/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
vuln.today AI
5.4 MEDIUM

Network-reachable and unauthenticated (AV:N/PR:N) but needs a specific UDS/ACL config to trigger (AC:H); the bypass exposes protected backend resources, so scope changes (S:C) with limited C/I impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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:N/SC:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

7
Analysis Updated
Jul 29, 2026 - 10:51 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 29, 2026 - 10:50 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) 7.0 (HIGH)
Analysis Generated
Jul 29, 2026 - 09:59 vuln.today
CVE Published
Jul 29, 2026 - 08:32 cve.org
MEDIUM 8.2

DescriptionCVE.org

Apache Traffic Server can bypass IP access controls on UDS listeners and through ACL matching errors.

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

Access control bypass in Apache Traffic Server (8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) allows remote attackers to defeat IP-based access restrictions, both on Unix Domain Socket (UDS) listeners and through faulty ACL matching logic. Because ATS commonly fronts internal origin servers and management endpoints, bypassing these IP allow/deny lists can expose protected backend resources that operators believed were network-restricted. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach ATS UDS/ACL-guarded listener
Delivery
Send request from disallowed source
Exploit
Trigger ACL match error or UDS bypass
Execution
ATS treats request as permitted
Impact
Access protected backend resource
Sign in to reveal

Vulnerability AssessmentAI

Exploitation Exploitation targets ATS deployments that enforce access control via IP-based ACLs and/or expose Unix Domain Socket (UDS) listeners - the bypass manifests specifically on UDS listeners (which do not apply the intended IP controls) and via incorrect ACL match evaluation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-supplied CVSS 4.0 base score is 7.0 (High) with vector AV:N/AC:L/AT:P/PR:N/UI:N and notably VC:N/VI:N/VA:N but SC:H/SI:H - i.e. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker whose source IP should be blocked crafts requests that either traverse a UDS listener or hit the flawed ACL matching path, causing ATS to treat the connection as permitted. With the IP restriction defeated, the attacker reaches an origin service, admin/remap route, or internal endpoint that operators assumed was reachable only from allow-listed addresses. …
Remediation Vendor-released patch: upgrade to Apache Traffic Server 9.2.15 or 10.1.4, which correct both the UDS listener bypass and the ACL matching error, per the Apache advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Recommended ActionAI

Within 24 hours, inventory all Apache Traffic Server instances and confirm their versions; enable detailed ACL evaluation logging and implement firewall-based network segmentation restricting ATS listeners to trusted source IP ranges only. …

Sign in for detailed remediation steps and compensating controls.

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

More in Apache Traffic Server

View all
CVE-2026-58161 CRITICAL
9.2 Jul 29

Remote denial of service in Apache Traffic Server (8.0.0-8.1.9, 9.0.0-9.2.14, 10.0.0-10.1.3) allows unauthenticated atta
CVE-2026-58154 CRITICAL
9.2 Jul 29

Out-of-bounds write and integer overflow in Apache Traffic Server's MIME and HTTP header parsing lets remote attackers c
CVE-2026-58155 CRITICAL
9.2 Jul 29

Request smuggling and policy bypass in Apache Traffic Server (branches 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) ari
CVE-2026-58151 HIGH
8.7 Jul 29

Denial of service in Apache Traffic Server 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3 lets remote unauthenticated atta
CVE-2026-58188 HIGH
8.4 Jul 29

Out-of-bounds write and limit-bypass flaws in several experimental plugins shipped with Apache Traffic Server (8.0.0-8.1
CVE-2026-58162 HIGH
8.4 Jul 29

Improper certificate generation in the Apache Traffic Server certifier plugin lets remote attackers dictate the contents
CVE-2026-58164 HIGH
8.3 Jul 29

Memory corruption in Apache Traffic Server's remap configuration handling lets remote attackers trigger a use-after-free
CVE-2026-58163 HIGH
8.3 Jul 29

Denial-of-service and cache-integrity corruption in Apache Traffic Server (8.0.0-8.1.9, 9.0.0-9.2.14, 10.0.0-10.1.3) all
CVE-2026-58184 HIGH
8.3 Jul 29

Out-of-bounds memory write in the Apache Traffic Server header_rewrite plugin allows remote attackers to crash the proxy
CVE-2026-58177 HIGH
8.3 Jul 29

Memory corruption in the Cripts scripting framework of Apache Traffic Server (versions 10.0.0 through 10.1.3) allows rem
CVE-2026-58180 HIGH
8.2 Jul 29

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 stack-b
CVE-2026-58178 HIGH
8.2 Jul 29

Denial of service in the Apache Traffic Server ESI (Edge Side Includes) plugin allows remote unauthenticated attackers t

Same weakness CWE-863 – Incorrect Authorization

View all
CVE-2025-54253 CRITICAL POC
10.0
CVE-2025-24200 MEDIUM
6.1
CVE-2025-21480 HIGH
8.6
CVE-2025-21479 HIGH
8.6
CVE-2025-32462 HIGH POC
8.8
CVE-2017-4915 HIGH POC
7.8
CVE-2024-6782 CRITICAL POC
9.8
CVE-2024-38856 CRITICAL POC
9.8

Same technique Authentication Bypass

View all
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2012-1723 CRITICAL POC
9.8
CVE-2017-10271 HIGH POC
7.5
CVE-2015-1427 CRITICAL POC
9.8
CVE-2025-3248 CRITICAL POC
9.8

Share

EUVD-2026-50212 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy