CVE-2026-59173

Apache Traffic Server: DoS vulnerability in HTTP/2 via stalled flow-control conditions

HIGH
7.5
CVSS Score
Published: July 18, 2026 at 12:52 PM UTC
Updated: October 24, 2026 at 08:10 PM UTC
1 product affected across 1 vendorTraffic Server

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

Uncontrolled Resource Consumption vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.0.0 through 9.1.13, from 10.0.0 through 10.1.2. Users are recommended to upgrade to version 9.1.14 or 10.1.3, which fixes the issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

10.0.0 ≤ v < 10.1.39.0.0 ≤ v < 9.2.1410.0.09.0.0
Affected range stops below 10.1.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.2.14, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

Vendor AdvisoryMailing List
Source: cverecord
https://lists.apache.org/thread/lhlbhphmv5dsfgx1fx84mgonzbocpzhd
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/07/17/5

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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