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PatchSiren cyber security CVE debrief

CVE-2026-55331 Google CVE debrief

A high-severity vulnerability exists in the IP Multimedia Subsystem, potentially allowing remote code execution with no additional execution privileges needed. This issue is due to an incorrect bounds check, which could lead to an out-of-bounds write. User interaction is not required for exploitation. The vulnerability affects systems using the IP Multimedia Subsystem, particularly those exposed to untrusted input. Administrators should assess their vulnerability and apply necessary updates or mitigations. The CVE record and NVD entry provide details on the vulnerability, including its high CVSS score of 8.8 and the potential for remote code execution.

Vendor
Google
Product
Android
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-15
Original CVE updated
2026-09-21
Advisory published
2026-09-15
Advisory updated
2026-09-21

Who should care

Administrators of systems using the IP Multimedia Subsystem, particularly those exposed to untrusted input, should assess their vulnerability and apply necessary updates or mitigations.

Why it matters

CVE-2026-55331 is a high-severity vulnerability in the IP Multimedia Subsystem that could allow remote code execution. Administrators should assess exposure, apply updates, and monitor for suspicious activity.

  • Potential remote code execution with no additional execution privileges needed
  • Out-of-bounds write due to incorrect bounds check
  • Requires immediate attention for administrators of affected systems

Technical summary

The vulnerability exists in the IP Multimedia Subsystem due to an incorrect bounds check, potentially allowing an out-of-bounds write and remote code execution with no additional execution privileges needed. The issue arises from improper validation of input data, which could be exploited by an attacker to execute arbitrary code. Administrators of affected systems should review and apply vendor-provided security updates to mitigate this vulnerability.

Defensive priority

Immediate attention is recommended for administrators of affected systems, particularly those with exposure to untrusted input.

Recommended defensive actions

  • Review and apply vendor-provided security updates for the IP Multimedia Subsystem
  • Implement additional monitoring for suspicious activity related to the IP Multimedia Subsystem
  • Restrict access to the IP Multimedia Subsystem to trusted sources only

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its high CVSS score of 8.8 and the potential for remote code execution. However, specific details about affected versions and remediation steps are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-55331 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-55331

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-55331 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-55331

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.