# CVE-2026-59692: Gstreamer1-plugins-bad-free: gstreamer: dtls certificate subject dn stack buffer overflow in openssl_verify_callback

Status: published. Published: 2026-07-09. Updated: 2026-11-04.

A stack buffer overflow vulnerability was found in GStreamer's DTLS plugin. During a DTLS handshake, the peer certificate Subject Distinguished Name is printed into a fixed-size 2048-byte stack buffer without bounds checking. A remote unauthenticated attacker can send a certificate with an oversized Subject DN that exceeds the buffer, causing a stack buffer overflow and process crash, resulting in denial of service.

## Remediation

- workaround: There is no complete mitigation for this vulnerability. The following measures can reduce risk:

1. If WebRTC/DTLS functionality is not required, remove the DTLS plugin shared object from the GStreamer plugins directory (typically /usr/lib64/gstreamer-1.0/libgstdtls.so).
2. Restrict network access to WebRTC/DTLS endpoints to trusted peers only via firewall rules.
3. Deploy GStreamer WebRTC services behind a reverse proxy or media server that validates DTLS certificates before forwarding. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (gstreamer1-plugins-bad-free): ≥ 0:1.26.7-2.el10_2.6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support (gstreamer1-plugins-bad-free): ≥ 0:1.24.11-3.el10_0.6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support (gstreamer1-plugins-bad-free): ≥ 0:1.10.4-7.el7_9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gstreamer1-plugins-bad-free): ≥ 0:1.16.1-9.el8_10.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (gstreamer1-plugins-bad-free): ≥ 0:1.16.1-4.el8_4.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (gstreamer1-plugins-bad-free): ≥ 0:1.16.1-4.el8_4.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (gstreamer1-plugins-bad-free): ≥ 0:1.16.1-4.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (gstreamer1-plugins-bad-free): ≥ 0:1.16.1-4.el8_6.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (gstreamer1-plugins-bad-free): ≥ 0:1.16.1-4.el8_8.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (gstreamer1-plugins-bad-free): ≥ 0:1.16.1-4.el8_8.4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gstreamer1-plugins-bad-free): ≥ 0:1.22.12-7.el9_8.3; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (gstreamer1-plugins-bad-free): ≥ 0:1.18.4-9.el9_2.5; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (gstreamer1-plugins-bad-free): ≥ 0:1.22.1-6.el9_4.6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support (gstreamer1-plugins-bad-free): ≥ 0:1.22.12-5.el9_6.6; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gstreamer-plugins-bad-free): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gstreamer-plugins-bad-free): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.58% as of 2026-11-04; percentile 47.69%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-121

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:47179 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:47180 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:47731 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:54658 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:54659 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:54660 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:54664 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:54665 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:54752 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:56658 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:56772 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-59692 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2497344 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/99 (CNA: redhat)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5172 (CNA: redhat)

- https://access.redhat.com/errata/RHSA-2026:47179 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:47180 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:47731 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:54658 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:54659 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:54660 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:54664 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:54665 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:54752 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:56658 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:56772 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2026-59692 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2497344 (secalert@redhat.com)

- https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/99 (secalert@redhat.com)

- https://gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5172 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-59692; retrieved 2026-11-05; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-59692; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-59692; retrieved 2026-11-05; source updated Not reported

Revision: edf9fe1d7317055246359dac413a1e94f7e310facd306e232e08694c74c23651

Canonical: https://y2.dev/cve/CVE-2026-59692

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