CVE-2026-18649

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Track)
EG Risk 65/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

August 6, 2026

Last Modified

September 17, 2026

Advisory Details (3)

Auto-updated Aug 6, 2026
Patch available. Sources: redhat.
generic

Sign in · GitLab

https://gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/113
redhat

2510614 – (CVE-2026-18649) CVE-2026-18649 gst-plugins-good: gst-plugins-good: unbounded memory growth in rtph264depay and rtph265depay RTP depayloaders

https://bugzilla.redhat.com/show_bug.cgi?id=2510614
redhat Patch Available

CVE-2026-18649 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18649

Vendor Advisories for CVE-2026-18649(8)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibgstreamer-plugins-good1.0-dev (1.8.3-1ubuntu0.5+esm2) @ xenial2026-09-19ubuntu
redhatgstreamer1-plugins-good-0:1.24.11-1.el10_0.42026-09-09redhat
redhatgstreamer1-plugins-good-0:1.18.4-8.el9_2.22026-09-09redhat
redhatgstreamer1-plugins-good-0:1.22.12-5.el9_6.22026-09-01redhat
redhatgstreamer1-plugins-good-0:1.22.1-4.el9_4.22026-08-31redhat
redhatgstreamer1-plugins-good-0:1.16.1-7.el8_10.32026-08-19redhat
redhatgstreamer1-plugins-good-0:1.22.12-7.el9_8.22026-08-11redhat
redhatgstreamer1-plugins-good-0:1.26.7-2.el10_2.32026-08-11redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
gst-plugins-good1.01.22.0-5 ... 1.29.2-1 (74 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
gst-plugins-good1.01.26.10-1 ... 1.29.2-1 (31 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
gst-plugins-good1.01.26.10-1 ... 1.28.5-1 (26 versions)1.28.6-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 44× in last 7d / 185× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 275 total refreshes for this CVE.

  1. 2026-09-19 04:38 UTCEG score recompute
  2. 2026-09-19 04:38 UTCVendor advisory
  3. 2026-09-19 04:38 UTCGHSA enrichment
  4. 2026-09-18 19:27 UTCEPSS rescore
  5. 2026-09-18 17:38 UTCVendor advisory
  6. 2026-09-18 17:38 UTCGHSA enrichment
  7. 2026-09-18 05:27 UTCEG score recompute
  8. 2026-09-18 05:27 UTCVendor advisory
  9. 2026-09-18 05:27 UTCGHSA enrichment
  10. 2026-09-17 18:27 UTCEG score recompute
  11. 2026-09-17 18:27 UTCVendor advisory
  12. 2026-09-17 18:27 UTCGHSA enrichment
  13. 2026-09-17 18:13 UTCVendor advisory
  14. 2026-09-17 18:13 UTCGHSA enrichment
  15. 2026-09-17 15:49 UTCVendor advisory
  16. 2026-09-17 15:49 UTCGHSA enrichment
  17. 2026-09-17 15:19 UTCVendor advisory
  18. 2026-09-17 15:19 UTCGHSA enrichment
  19. 2026-09-17 01:03 UTCEG score recompute
  20. 2026-09-17 01:03 UTCVendor advisory
  21. 2026-09-17 01:03 UTCGHSA enrichment
  22. 2026-09-16 14:07 UTCEPSS rescore
  23. 2026-09-16 05:14 UTCEPSS rescore
  24. 2026-09-16 03:08 UTCVendor advisory
  25. 2026-09-16 03:08 UTCGHSA enrichment
Show 75 more
  1. 2026-09-15 14:51 UTCEG score recompute
  2. 2026-09-15 14:51 UTCVendor advisory
  3. 2026-09-15 14:51 UTCGHSA enrichment
  4. 2026-09-15 01:18 UTCVendor advisory
  5. 2026-09-15 01:18 UTCGHSA enrichment
  6. 2026-09-14 08:41 UTCVendor advisory
  7. 2026-09-14 08:41 UTCGHSA enrichment
  8. 2026-09-13 21:41 UTCEG score recompute
  9. 2026-09-13 21:41 UTCVendor advisory
  10. 2026-09-13 21:41 UTCGHSA enrichment
  11. 2026-09-13 16:46 UTCEPSS rescore
  12. 2026-09-13 10:40 UTCVendor advisory
  13. 2026-09-13 10:40 UTCGHSA enrichment
  14. 2026-09-12 23:38 UTCEG score recompute
  15. 2026-09-12 23:38 UTCVendor advisory
  16. 2026-09-12 23:38 UTCGHSA enrichment
  17. 2026-09-12 15:00 UTCEPSS rescore
  18. 2026-09-12 12:38 UTCVendor advisory
  19. 2026-09-12 12:38 UTCGHSA enrichment
  20. 2026-09-12 01:38 UTCEG score recompute
  21. 2026-09-12 01:38 UTCVendor advisory
  22. 2026-09-12 01:38 UTCGHSA enrichment
  23. 2026-09-11 14:52 UTCEPSS rescore
  24. 2026-09-11 14:38 UTCEG score recompute
  25. 2026-09-11 14:38 UTCVendor advisory
  26. 2026-09-11 14:38 UTCGHSA enrichment
  27. 2026-09-11 09:36 UTCEPSS rescore
  28. 2026-09-11 02:28 UTCVendor advisory
  29. 2026-09-11 02:28 UTCGHSA enrichment
  30. 2026-09-10 15:28 UTCEG score recompute
  31. 2026-09-10 15:28 UTCVendor advisory
  32. 2026-09-10 15:28 UTCGHSA enrichment
  33. 2026-09-10 09:34 UTCEPSS rescore
  34. 2026-09-10 04:56 UTCVendor advisory
  35. 2026-09-10 04:56 UTCGHSA enrichment
  36. 2026-09-09 17:34 UTCEG score recompute
  37. 2026-09-09 17:34 UTCVendor advisory
  38. 2026-09-09 17:34 UTCGHSA enrichment
  39. 2026-09-09 16:54 UTCEG score recompute
  40. 2026-09-09 16:54 UTCVendor advisory
  41. 2026-09-09 16:54 UTCGHSA enrichment
  42. 2026-09-09 14:31 UTCEG score recompute
  43. 2026-09-09 14:31 UTCVendor advisory
  44. 2026-09-09 14:31 UTCGHSA enrichment
  45. 2026-09-09 13:39 UTCEG score recompute
  46. 2026-09-09 13:39 UTCVendor advisory
  47. 2026-09-09 13:38 UTCGHSA enrichment
  48. 2026-09-09 06:16 UTCEG score recompute
  49. 2026-09-09 06:16 UTCVendor advisory
  50. 2026-09-09 06:16 UTCGHSA enrichment
  51. 2026-09-08 22:00 UTCEPSS rescore
  52. 2026-09-08 07:45 UTCVendor advisory
  53. 2026-09-08 07:45 UTCGHSA enrichment
  54. 2026-09-07 18:07 UTCEG score recompute
  55. 2026-09-07 18:07 UTCVendor advisory
  56. 2026-09-07 18:07 UTCGHSA enrichment
  57. 2026-09-07 16:01 UTCEPSS rescore
  58. 2026-09-06 16:02 UTCEG score recompute
  59. 2026-09-06 16:02 UTCVendor advisory
  60. 2026-09-06 16:02 UTCGHSA enrichment
  61. 2026-09-06 13:47 UTCEPSS rescore
  62. 2026-09-06 05:02 UTCVendor advisory
  63. 2026-09-06 05:02 UTCGHSA enrichment
  64. 2026-09-05 18:02 UTCEG score recompute
  65. 2026-09-05 18:02 UTCVendor advisory
  66. 2026-09-05 18:02 UTCGHSA enrichment
  67. 2026-09-05 03:41 UTCEG score recompute
  68. 2026-09-05 03:41 UTCVendor advisory
  69. 2026-09-05 03:41 UTCGHSA enrichment
  70. 2026-09-04 09:25 UTCEG score recompute
  71. 2026-09-04 09:25 UTCVendor advisory
  72. 2026-09-04 09:25 UTCGHSA enrichment
  73. 2026-09-04 05:06 UTCEPSS rescore
  74. 2026-09-03 17:30 UTCVendor advisory
  75. 2026-09-03 17:30 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC0xSemizzz/CVE-2026-18649
    First seen Aug 6, 2026

    Proof of concept for CVE-2026-18649, a remote denial of service vulnerability in GStreamer's H.264 RTP depayloader (rtph264depay).

    Open source ↗

Frequently asked(5)

What is CVE-2026-18649?
CVE-2026-18649 is a high vulnerability published on August 6, 2026. 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…
When was CVE-2026-18649 disclosed?
CVE-2026-18649 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18649 actively exploited?
CVE-2026-18649 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 42.4% of all scored CVEs.
What is the CVSS score of CVE-2026-18649?
CVE-2026-18649 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-18649?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18649, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-18649

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