CVE-2026-65324 Apache Traffic Server: HTTP/2 and HTTP/3 dechunking removes per-stream buffer cap, allowing memory exhaustion

What is CVE-2026-65324?

CVE-2026-65324 is a high-severity denial of service vulnerability in Apache Traffic Server, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Apache Traffic Server drops the per-stream buffer cap when dechunking HTTP/2 or HTTP/3 responses, letting a slow client exhaust server memory.

This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, 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.

Weakness: CWE-400

Which versions are affected by CVE-2026-65324?

It affects 1 product.

Products include Apache Traffic Server.

How do I fix CVE-2026-65324?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-65324 being exploited?

There is no known exploitation of CVE-2026-65324 in the wild and no public exploit code.

Other vulnerabilities in Apache Traffic Server

• CVE-2014-3525 Other in n/a Critical 10.0
• CVE-2021-43082 heap-buffer-overflow with stats-over-http plugin Critical 9.8
• CVE-2021-35474 Dynamic stack buffer overflow in cachekey plugin Critical 9.8
• CVE-2019-17559 Other in Apache Traffic Server Critical 9.8
• CVE-2019-17565 Other in Apache Traffic Server Critical 9.8

All Apache Traffic Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-65324, GHSA-q67c-46w2-2p7h, UBUNTU-CVE-2026-65324.