Critical severity · published Sep 15, 2026
CVE-2026-55366
In IP Multimedia Subsystem, there is a possible authentication bypass due to a logic error in the code
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
In IP Multimedia Subsystem, there is a possible authentication bypass due to a logic error in the code. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AN
Android · Google
Android kernel · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55366
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55366
Vendor Advisory
https://source.android.com/docs/security/bulletin/pixel/2026/2026-09-01
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