Critical severity · published Oct 21, 2026
CVE-2026-111814
Apache Traffic Server: Default server_session_sharing.match omits MASK_CERT, allowing pooled mTLS identity confusion at the origin
New
10.0
CVSS
0.2%
EPSS
No
On KEV
Description
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 issue affects Apache Traffic Server: 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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AT
Apache Traffic Server · Apache Software Foundation
9.0.0 through 9.2.15; 10.0.0 through 10.1.4; 10.2.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111814
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111814
lists.apache.org
https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc
More from Apache Traffic Server
10.0
CVE-2026-111812
Apache Traffic Server: origin_server_auth signs client-controlled AWS headers under the proxy's IAM credentials
10.0
CVE-2026-111815
Apache Traffic Server: TLS session ticket resumption bypasses per-SNI verify_client STRICT enforcement
10.0
CVE-2026-111813
Apache Traffic Server: magick plugin passes client query strings unfiltered to ImageMagick convert in the default configuration
10.0
CVE-2026-58162
Apache Traffic Server: Certifier plugin trusts client SNI when generating certificates
10.0
CVE-2026-58150
Apache Traffic Server: HTTP/2 requests with Transfer-Encoding are not rejected, allowing request smuggling