What is CVE-2026-55343?

CVE-2026-55343 is a high-severity vulnerability in Google Android, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.0/10. Published 2026-09-15.

How severe is CVE-2026-55343?

High severity. CVSS v3 base score is 8.0 out of 10.

Buffer overflow in Google Android

CVE-2026-55343

In decodeAmr of ImsMediaAudioPlayer.cpp, there is a possible out-of-bounds write due to a missing bounds check. This could lead to remote code execution with no additional execution privileges needed. User interaction is needed for exploitation.

Vulnerability class: Buffer Overflow

Published 2026-09-15 · last modified 2026-09-21.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.2th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Google Android — versions Android kernel

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

source.android.com/docs/security/bulletin/pixel/2026/2026-09-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-55343?: CVE-2026-55343 is a high-severity vulnerability in Google Android, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.0/10. Published 2026-09-15.
How severe is CVE-2026-55343?: High severity. CVSS v3 base score is 8.0 out of 10.