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CVE-2026-65324 Apache CVE debrief

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 8.1.9, 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. The vulnerability can lead to a denial-of-service (DoS) condition due to memory exhaustion. It is crucial for administrators and users of Apache Traffic Server, especially those using affected versions, to be aware of this vulnerability and take necessary actions to upgrade or mitigate the risk. This includes reviewing system configurations, assessing potential impact, and implementing compensating controls where needed.

Vendor
Apache
Product
Traffic Server
CVSS
HIGH 8.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-29
Original CVE updated
2026-08-03
Advisory published
2026-07-29
Advisory updated
2026-08-03

Who should care

Administrators and users of Apache Traffic Server, especially those using affected versions, should be aware of this vulnerability and take necessary actions to upgrade or mitigate the risk. This includes reviewing system configurations, assessing potential impact, and implementing compensating controls where needed. Security teams should prioritize patching and monitor for potential memory exhaustion issues.

Technical summary

The vulnerability occurs when Apache Traffic Server drops the per-stream buffer cap during dechunking of HTTP/2 or HTTP/3 responses. This allows a slow client to potentially exhaust server memory, leading to a denial-of-service (DoS) condition. The issue affects multiple versions of Apache Traffic Server, specifically from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, and from 10.0.0 through 10.1.3. Further review of system configurations and compensating controls is recommended.

Defensive priority

High priority due to potential for memory exhaustion

Recommended defensive actions

  • Upgrade to version 9.2.15 or 10.1.4
  • Review and apply vendor recommendations
  • Monitor for potential memory exhaustion issues
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

Evidence from official CVE and NVD sources indicate a vulnerability in Apache Traffic Server. The CVE record and NVD detail provide information on the vulnerability, affected versions, and recommended upgrades. However, further verification is needed to confirm affected deployments and assess potential impact. Defenders should review official advisories and track exceptions for exposed systems.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-29T09:16:30.410Z and has not been modified since then. The NVD entry is currently Analyzed.