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: 1.0%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.0%
EPSS %ILE
60th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 6, 2026

Last Modified

September 23, 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(12)

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

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibgstreamer-plugins-good1.0-dev (1.20.3-0ubuntu1.8) @ jammy2026-10-04ubuntu
redhatgstreamer1-plugins-good-0:1.16.1-4.el8_4.22026-09-23redhat
redhatgstreamer1-plugins-good-0:1.16.1-4.el8_6.32026-09-23redhat
redhatgstreamer1-plugins-good-0:1.10.4-4.el7_9.32026-09-22redhat
redhatgstreamer1-plugins-good-0:1.16.1-5.el8_8.32026-09-21redhat
redhatgstreamer1-plugins-good-0:1.18.4-8.el9_2.22026-09-09redhat
redhatgstreamer1-plugins-good-0:1.24.11-1.el10_0.42026-09-09redhat
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 rangeFix by version rangeDependents
gst-plugins-good1.01.22.0-5 ... 1.29.2-1 (75 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
gst-plugins-good1.01.26.10-1 ... 1.29.2-1 (32 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gst-plugins-good1.01.26.10-1 ... 1.28.5-1 (26 versions)
  • every version up to 1.28.6-1: fixed in 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 25× in last 7d / 169× 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 353 total refreshes for this CVE.

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

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 ↗

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:56966

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 on August 6, 2026, with the most recent update on September 23, 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 1.0% probability of exploitation in the next 30 days (60th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18649?
CVE-2026-18649 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18649?
A fix for CVE-2026-18649 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18649 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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