SB20260824179 - Multiple vulnerabilities in Apache Traffic Server

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Main Vulnerability Database SB20260824179

SB20260824179 - Multiple vulnerabilities in Apache Traffic Server

Published: August 24, 2026

Security Bulletin ID SB20260824179
CSH Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 25% Medium 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Resource exhaustion (CVE-ID: CVE-2026-65324)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper resource management in HTTP/2 and HTTP/3 response dechunking when dechunking responses for a slow client. A remote attacker can trigger unbounded buffering to cause a denial of service.

Only dechunked HTTP/2 or HTTP/3 responses are affected.


2) Stack-based buffer overflow (CVE-ID: CVE-2026-33930)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to stack-based buffer overflow in redirect handling when copying a client Host header into a fixed-size stack buffer. A remote attacker can send an over-long Host header to cause a denial of service.

The issue is triggered when redirect following is enabled.


3) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-65100)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to corrupt subsequent HTTP/2 header processing.

The vulnerability exists due to improper state management in the HTTP/2 HPACK encoder when handling a failed header encode. A remote attacker can trigger an encode failure to corrupt subsequent HTTP/2 header processing.

The issue leaves the encoder out of sync with the peer decoder on the connection.


4) Improper Certificate Validation (CVE-ID: CVE-2026-65325)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass certificate hostname validation.

The vulnerability exists due to improper certificate validation in HTTP/2 multiplexed origin session reuse when reusing origin connections for a new request hostname. A remote attacker can trigger reuse of an existing connection to bypass certificate hostname validation.


Remediation

Install update from vendor's website.

References