What is CVE-2026-5186?

CVE-2026-5186 is a medium-severity vulnerability in Nothings Stb, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-03-31.

How severe is CVE-2026-5186?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in Nothings Stb

CVE-2026-5186

A weakness has been identified in Nothings stb up to 2.30. This impacts the function stbi__load_gif_main of the file stb_image.h of the component Multi-frame GIF File Handler. This manipulation causes double free. The attack requires local access. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Vulnerability class: Buffer Overflow

Published 2026-03-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (4.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

Nothings Stb — versions 2.0, 2.1, 2.2

Weakness classification (CWE)

References

vuldb.com/vuln/354254 (technical-description, vdb-entry)
vuldb.com/vuln/354254/cti (signature, permissions-required)
vuldb.com/submit/780395 (third-party-advisory)

Frequently asked questions

What is CVE-2026-5186?: CVE-2026-5186 is a medium-severity vulnerability in Nothings Stb, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-03-31.
How severe is CVE-2026-5186?: Medium severity. CVSS v3 base score is 5.3 out of 10.