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Apache Traffic Server EUVDEUVD-2026-50226

| CVE-2026-58181 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-07-29 apache GHSA-2vfg-xrq7-ffvf
Buffer Overflow Apache Stack Overflow 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: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
7.5 HIGH

Remote unauthenticated request crashes the proxy with no user interaction; impact is availability-only, so C:N/I:N/A:H, while the plugin-enabled precondition is a config dependency, not per-attack complexity, keeping AC:L.

3.1 AV:N/AC:L/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: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 - 10:38 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 - 09:56 vuln.today
CVE Published
Jul 29, 2026 - 08:46 cve.org
MEDIUM 7.5

DescriptionCVE.org

The Apache Traffic Server uri_signing and url_sig plugins can exhaust the stack or crash on attacker input.

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 (8.0.0-8.1.9, 9.0.0-9.2.14, 10.0.0-10.1.3) lets remote attackers crash the proxy by sending crafted input to the uri_signing or url_sig plugins, which recurse or copy unbounded data onto the stack until it is exhausted (CWE-121 stack-based buffer overflow). Only deployments that have loaded and enabled one of these URL-signing plugins are exposed; the impact is availability-only, with no confidentiality or integrity loss. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach signing-enabled ATS endpoint
Delivery
Craft malformed uri_signing/url_sig token
Exploit
Send request to plugin parser
Execution
Trigger unbounded stack recursion/copy
Persist
Exhaust stack and crash worker
Impact
Denial of service on edge node
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Apache Traffic Server instance has the uri_signing plugin or the url_sig plugin loaded and enabled on a reachable route - this is the exact precondition reflected by the CVSS 4.0 AT:P metric, and installations without either plugin are not exploitable. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are consistent and point to a moderate-to-high but availability-scoped risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker identifies an internet-facing Traffic Server edge node that fronts protected content using signed URLs, then sends a crafted request whose token/URI field is shaped to drive the uri_signing or url_sig parser into deep recursion or an oversized stack copy. With AV:N/AC:L/PR:N/UI:N, no authentication or user interaction is needed, so a single malformed request - or a small stream of them - repeatedly crashes the proxy and denies service to legitimate users. …
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), per the advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d; users on the 8.0.0-8.1.9 branch, for which no fixed 8.x release is listed, should upgrade to 9.2.15 or 10.1.4. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, determine if uri_signing or url_sig plugins are loaded and enabled in your Apache Traffic Server deployment; installations without these plugins are not affected. …

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EUVD-2026-50226 vulnerability details – vuln.today
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