What is CVE-2026-39103?

CVE-2026-39103 is a medium-severity vulnerability in Gpac, classified under Heap-based Buffer Overflow. CVSS score: 5.5/10. Published 2026-05-05.

How severe is CVE-2026-39103?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Gpac

CVE-2026-39103

Buffer Overflow vulnerability in GPAC before commit v391dc7f4d234988ea0bc3cc294eb725eddf8f702 allows an attacker to cause a denial of service via the src/scenegraph/svg_attributes.c, svg_parse_strings(), gf_svg_parse_attribute()

Vulnerability class: Buffer Overflow

Published 2026-05-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (4.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 4.0% 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

Gpac

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

github.com/gpac/gpac/commit/391dc7f4d234988ea0bc3cc294eb725eddf8f702 (Patch)
github.com/gpac/gpac/issues/3506 (Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-39103?: CVE-2026-39103 is a medium-severity vulnerability in Gpac, classified under Heap-based Buffer Overflow. CVSS score: 5.5/10. Published 2026-05-05.
How severe is CVE-2026-39103?: Medium severity. CVSS v3 base score is 5.5 out of 10.