CVE-2026-18649 (GCVE-0-2026-18649)
Vulnerability from cvelistv5 – Published: 2026-08-06 06:48 – Updated: 2026-09-23 15:06
VLAI
EPSS
VEX
Title
Gstreamer1-plugins-good: gst-plugins-good: unbounded memory growth in rtph264depay and rtph265depay rtp depayloaders
Summary
A flaw was found in the GStreamer gst-plugins-good package. The rtph264depay and rtph265depay RTP depayloader elements do not enforce a maximum size limit on the reassembly buffer used during fragmented RTP packet processing. A remote, unauthenticated attacker can send a continuous stream of RTP fragments without ever transmitting an end-of-fragment marker, causing the reassembly buffer to grow without bound until process memory is exhausted. This results in a denial of service through process termination.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 13:42 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
16 references
Impacted products
14 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:1.26.7-2.el10_2.3 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:1.24.11-1.el10_0.4 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
||
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support |
Unaffected:
0:1.10.4-4.el7_9.3 , < *
(rpm)
cpe:/o:redhat:rhel_els:7 |
||
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:1.16.1-7.el8_10.3 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
0:1.16.1-4.el8_4.2 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
0:1.16.1-4.el8_4.2 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
0:1.16.1-4.el8_6.3 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On |
Unaffected:
0:1.16.1-4.el8_6.3 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream |
||
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
0:1.16.1-5.el8_8.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream |
||
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
0:1.16.1-5.el8_8.3 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:1.22.12-7.el9_8.2 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream |
||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:1.18.4-8.el9_2.2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2::appstream |
||
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:1.22.1-4.el9_4.2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4::appstream |
||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:1.22.12-5.el9_6.2 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6::appstream |
Date Public
2026-08-06 06:41
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"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510614"
},
{
"url": "https://github.com/0xSemizzz/CVE-2026-18649"
},
{
"url": "https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/113"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-07-31T15:39:42.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-08-06T06:41:36.036Z",
"value": "Made public."
}
],
"title": "Gstreamer1-plugins-good: gst-plugins-good: unbounded memory growth in rtph264depay and rtph265depay rtp depayloaders",
"workarounds": [
{
"lang": "en",
"value": "The following mitigations can reduce risk before a patch is available:\n\n1. Use SRTP or DTLS-SRTP: Deploy the srtpdec element in the pipeline before the depayloader. SRTP provides per-packet authentication and will reject unauthenticated fragments before they reach rtph264depay/rtph265depay, completely preventing exploitation.\n\n2. Network-level restriction: Use firewall rules (iptables/nftables) to restrict which sources can send RTP traffic to the GStreamer process. Allow RTP only from trusted, authenticated peers.\n\n3. Build-time exclusion: Disable the entire RTP plugin by configuring with \"-Drtp=disabled\" in meson build options. This removes all RTP functionality including the vulnerable depayloaders.\n\n4. Runtime element exclusion: Prevent the affected elements from being auto-plugged by setting GST_PLUGIN_FEATURE_RANK=rtph264depay:0,rtph265depay:0. This prevents automatic selection but not explicit pipeline construction."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-770: Allocation of Resources Without Limits or Throttling"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2026-18649",
"datePublished": "2026-08-06T06:48:10.027Z",
"dateReserved": "2026-08-03T11:33:04.652Z",
"dateUpdated": "2026-09-23T15:06:16.075Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.