CVE-2026-56209

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-19. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.1Exploit: None knownExposed: 0

A fix is available — apply it.

An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel values. The encoder then writes approximately 1,200 bytes at the attacker-controlled address. This is fully deterministic and does not require a separate information leak. An attacker who can supply frames to a network-facing libaom encoder with SVC enabled could exploit this for denial of service or potential code execution.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
41%
KEV
Not listed

Published

June 19, 2026

Last Modified

July 22, 2026

Advisory Details (4)

Auto-updated Jun 22, 2026
Patch available. Sources: redhat.
generic

Chromium

https://issues.chromium.org/issues/503993984
redhat

2490800 – (CVE-2026-56209) CVE-2026-56209 libaom: libaom: arbitrary address write via SVC layer context OOB and cyclic refresh map pointer hijack

https://bugzilla.redhat.com/show_bug.cgi?id=2490800
generic

a93ba0ffaa - aom - Git at Google

https://aomedia.googlesource.com/aom/+/a93ba0ffaa
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-56209

Vendor Advisories for CVE-2026-56209(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhataom-0:3.14.0-1.el9ai2026-07-21redhat
redhataom-main-3.14.0-0.1.hum12026-06-28redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 119× 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 140 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56209?
CVE-2026-56209 is a high vulnerability published on June 19, 2026. An arbitrary address write vulnerability was found in libaom, the reference AV1 codec implementation. A missing bounds check in the SVC (Scalable Video Coding) layer ID control function allows an attacker to inject an arbitrary pointer into the cyclic refresh map field via crafted image pixel…
When was CVE-2026-56209 disclosed?
CVE-2026-56209 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56209 actively exploited?
CVE-2026-56209 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 59.4% of all scored CVEs.
What is the CVSS score of CVE-2026-56209?
CVE-2026-56209 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-56209?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56209, 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

Explore the affected products and dependency analysis for CVE-2026-56209

Explore →

Is Your Infrastructure Affected by CVE-2026-56209?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs