What is CVE-2026-21096?

CVE-2026-21096 is a critical-severity vulnerability in Samsung Android, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-09-09.

How severe is CVE-2026-21096?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-21096 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Samsung Android

CVE-2026-21096

Heap-based buffer overflow in JPEG decoder of libimagecodec.quram.so prior to SMR Sep-2026 Release 1 allows remote attackers to execute arbitrary code.

Vulnerability class: Buffer Overflow

Published 2026-09-09 · last modified 2026-09-11.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (39.3th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Samsung Android — versions 14.0, 15.0, 16.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

Xen0nize/CVE-2026-21096

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2026-21096?: CVE-2026-21096 is a critical-severity vulnerability in Samsung Android, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-09-09.
How severe is CVE-2026-21096?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-21096 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.