CVE-2026-111816
CriticalCVSS 9.3Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
Apache Traffic Server forwards malformed 302 responses that should be rejected as parse errors because the Transfer-Encoding: chunked carve-out bypasses the rejection path. A response that two peers can read differently is stored and served, allowing cache poisoning and response-framing desync.
Risk Assessment
This can lead to cache poisoning and response desynchronization, potentially serving users false content or enabling further attacks.
Recommendation
Upgrade Apache Traffic Server to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
Other vulnerabilities in Apache Traffic Server
See all- CVE-2017-5659High
Apache Traffic Server before 6.2.1 generates a coredump when there is a mismatch between content length and chunked encoding.
- CVE-2016-5396High
Apache Traffic Server versions 6.0.0 to 6.2.0 are affected by an HPACK Bomb Attack.
- CVE-2014-3525High
Unspecified vulnerability in Apache Traffic Server versions 3.x through 3.2.5, 4.x before 4.2.1.1, and 5.x before 5.0.1. This vulnerability may be related to health checks, but its impact and attack vectors are unknown.
- CVE-2026-111815Critical
Apache Traffic Server can resume a TLS session across SNI virtual hosts without re-verifying a client certificate required by the resumed host's verify_client STRICT policy. This affects versions 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0.
- CVE-2026-111814Critical
Apache Traffic Server's default outbound session-sharing policy can reuse a pooled TLS session authenticated with one client certificate for a transaction configured to present a different one. This affects versions 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0.
- CVE-2026-111812Critical
Apache Traffic Server's origin_server_auth plugin lets a client force signing of attacker-chosen AWS request headers under the proxy's own credentials. Affects versions 8.0.0–8.1.11, 9.0.0–9.2.15, 10.0.0–10.1.4, and 10.2.0.
- CVE-2026-111811Critical
Apache Traffic Server's experimental tsmemcache plugin allows unauthenticated network read, write, and deletion of the shared proxy cache. Affects versions 8.0.0–8.1.11, 9.0.0–9.2.15, 10.0.0–10.1.4, and 10.2.0.
- CVE-2026-111809Critical
Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding headers. This affects versions 8.0.0 through 8.1.11, 9.0.0 through 9.2.15, 10.0.0 through 10.1.4, and 10.2.0.
- CVE-2026-111813Critical
Apache Traffic Server's experimental magick plugin lets an unauthenticated client control ImageMagick convert arguments in its default (unsigned) configuration. Affects versions 8.0.1–8.1.11, 9.0.0–9.2.15, 10.0.0–10.1.4, and 10.2.0.
- CVE-2026-102795Critical
Apache Traffic Server contains an improper access control vulnerability. This issue affects Apache Traffic Server from 9.0.0 through 9.2.14 and from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fixes the issue. This CVE supersedes CVE-2026-41920, whose record listed the affected 9.x versions as 9.0.0 through 9.1.14 and the fixed version as 9.1.15; all 9.2.x releases before 9.2.15 are affected.
Original NVD description (English source)
Apache Traffic Server forwarded a malformed 302 response that should have been rejected as a parse error, because the Transfer-Encoding: chunked carve-out bypassed the rejection path. A response that two peers can read differently is then stored and served, allowing cache poisoning and response-framing desync. 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS