CVE-2026-111808: high-severity vulnerability in Apache Traffic Server
Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustion
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.7epss 0.4%
Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a malformed padded HTTP/2 DATA frame.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.
Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H
Affected products
Apache Software Foundation · Apache Traffic ServerRelated CVEs — Apache Traffic Server
In the same product, most dangerous first.
CVE-2024-31309HIGHApache Traffic Server: HTTP/2 CONTINUATION frames can be utilized for DoS attackEPSS 94.6%CVE-2023-39456HIGHApache Traffic Server: Malformed http/2 frames can cause an abortEPSS 58.3%CVE-2018-1318—CVE-2018-1318EPSS 7.6%CVE-2018-8022—CVE-2018-8022EPSS 7.4%CVE-2018-8040—CVE-2018-8040EPSS 7.2%CVE-2018-8005—CVE-2018-8005EPSS 6.8%