CVE-2025-55641: A NULL pointer dereference in the gf_isom_copy_sample_info function (isomedia/isom_write.c) of GPAC MP4Box v2.

Q: How do I fix CVE-2025-55641?

gpac: upgrade to 26.02.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-55641 being exploited?

CVE-2025-55641 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-2025-55641 affect?

CVE-2025-55641 affects gpac. Severity is medium (CVSS 5.5). A NULL pointer dereference in the gf_isom_copy_sample_info function (isomedia/isom_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.

Q: How urgent is CVE-2025-55641?

Priority 28/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2025-55641 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.

A NULL pointer dereference in the gf_isom_copy_sample_info function (isomedia/isom_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.

Why this priority

Public exploit reference

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	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-06-15
Last modified	2026-10-13

Publisher (CNA): MITRE · Vendor: gpac

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-15 20:16 UTCPublished CVE record published
2026-10-13 10:10 UTCUpdated Record last modified

gpac gpac UPGRADE

Affected: < 26.02.0

Fixed in: 26.02.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 26.02.0 (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-2025-55641?

gpac: upgrade to 26.02.0. Exact commands for each OS are on this page.

Is CVE-2025-55641 being exploited?

CVE-2025-55641 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-2025-55641 affect?

CVE-2025-55641 affects gpac. Severity is medium (CVSS 5.5). A NULL pointer dereference in the gf_isom_copy_sample_info function (isomedia/isom_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.

How urgent is CVE-2025-55641?

Priority 28/100. Public exploit reference

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CVE-2025-55645 MEDIUM 5.5 UPGRADE A heap buffer overflow in the gf_cenc_set_pssh function (isomedia/drm_sample.c) of GPAC MP4Box v2.4 allows att
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References

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