CVE-2026-39103: Buffer Overflow vulnerability in GPAC before commit v391dc7f4d234988ea0bc3cc294eb725eddf8f702 allows an attack

Q: How do I fix CVE-2026-39103?

gpac: upgrade to 2026-04-01. Exact commands for each OS are on this page.

Q: Is CVE-2026-39103 being exploited?

CVE-2026-39103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-39103 affect?

CVE-2026-39103 affects gpac. Severity is medium (CVSS 5.5). 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()

Q: How urgent is CVE-2026-39103?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2026-39103 is a medium-severity flaw (CVSS 5.5) affecting gpac. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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()

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-05-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gpac

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 16:16 UTCPublished CVE record published
2026-06-17 10:41 UTCUpdated Record last modified

gpac gpac UPGRADE

Affected: < 2026-04-01

Fixed in: 2026-04-01

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy gpac || rpm -q gpac || gpac --version

2. UPGRADE to 2026-04-01 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gpac

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gpac

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39103?

gpac: upgrade to 2026-04-01. Exact commands for each OS are on this page.

Is CVE-2026-39103 being exploited?

CVE-2026-39103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39103 affect?

CVE-2026-39103 affects gpac. Severity is medium (CVSS 5.5). 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()

How urgent is CVE-2026-39103?

Priority 20/100. No elevated risk signals yet.

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References

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