CVE-2026-125704: Use-After-Free (CVSS 7.5)

Description

A use-after-free flaw was found in GStreamer core buffer value deserialization. When serialized buffer text contains an invalid character, an error path frees a mapped buffer before unmapping it. Applications that parse untrusted caps or structure data can reach a freed-buffer read and may crash. A network-facing GStreamer Data Protocol receiver can process such caps data without user interaction; further impact has not been established.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0053

Probability of exploitation

0.45%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-416 Use After Free

References

Other References

https://access.redhat.com/errata/RHSA-2026:99090 https://access.redhat.com/errata/RHSA-2026:99129 https://access.redhat.com/errata/RHSA-2026:99228 https://access.redhat.com/security/cve/CVE-2026-125704 https://bugzilla.redhat.com/show_bug.cgi?id=2569128 https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/11583.patch https://gstreamer.freedesktop.org/security/sa-2026-0028.html

Frequently Asked Questions

What is CVE-2026-125704? +

A use-after-free flaw was found in GStreamer core buffer value deserialization. When serialized buffer text contains an invalid character, an error path frees a mapped buffer before unmapping it. Applications that parse untrusted caps or structure data can reach a freed-buffer read and may crash. A network-facing GStreamer Data Protocol receiver can process such caps data without user interaction; further impact has not been established. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-125704? +

CVE-2026-125704 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0053, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-125704? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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