# CVE-2026-21116: libsmkvextractor out-of-bounds write

Source: https://junglewise.ai/threats/cve-2026-21116-out-of-bounds-write-in-libsmkvextractor-so-prior-to-smr-oct-2026  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-12. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-21116 · Severity: info · Published 2026-10-12

An out-of-bounds write vulnerability exists in libsmkvextractor.so, a component used for extracting metadata from video files in Samsung devices. A local attacker could exploit this to write data outside intended memory boundaries, potentially leading to privilege escalation or system compromise.

Technologies: [Samsung Mobile Firmware](https://junglewise.ai/threats/technologies/mobile-firmware). Vendors: [Samsung](https://junglewise.ai/threats/vendors/samsung).

## Quick answers

**Is CVE-2026-21116 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21116 being exploited in the wild.

**How severe is CVE-2026-21116?** Informational severity, published 12 October 2026.

**Which products and versions are affected?** Samsung Mobile Firmware prior to October 2026 Release 1.

**Is there a fix for CVE-2026-21116?** Yes: fixed in October 2026 Release 1 and later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-21116 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-21116?** Check whether you run Samsung Mobile Firmware at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in October 2026 Release 1 and later

## Technical details

An out-of-bounds write flaw exists in libsmkvextractor.so that allows local attackers to write beyond allocated buffer boundaries. The vulnerability requires local access and affects Samsung firmware prior to the October 2026 Release 1. Exploitation could lead to memory corruption and potential privilege escalation.

## Affected products

- Samsung Samsung Mobile Firmware prior to October 2026 Release 1

## Timeline

- 2026-10-12: disclosed

## References

- [https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=10](https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=10)