CVE-2026-56210
CVE-2026-56210 is a high-severity vulnerability with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: High (CVSS 3.x base score 7.1)
- EPSS exploit prediction: 0% (16th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-38046
- Weakness: CWE-125
- Published:
- Last modified:
Description
A heap-buffer-overflow read 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 setting a spatial_layer_id exceeding the configured number of layers. This causes an out-of-bounds heap read of approximately 40,728 bytes when computing a layer context array index. An attacker who can influence SVC encoder parameters in a network-facing service could exploit this for information disclosure (heap content leak) or denial of service (segmentation fault from hitting unmapped memory).
Frequently asked questions
- What is CVE-2026-56210?
- A heap-buffer-overflow read 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 setting a spatial_layer_id exceeding the configured number of layers. This causes an out-of-bounds heap read of approximately 40,728 bytes when computing a layer context array index. An attacker who can influence SVC encoder parameters in a network-facing service could exploit this for information disclosure (heap content leak) or denial of service (segmentation fault from hitting unmapped memory).
- How severe is CVE-2026-56210?
- CVE-2026-56210 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability high.
- Is CVE-2026-56210 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-56210?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-56210 have an EU (EUVD) identifier?
- Yes. CVE-2026-56210 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38046.
- When was CVE-2026-56210 published?
- CVE-2026-56210 was published on 2026-06-19 and last updated on 2026-07-08.
References
- https://access.redhat.com/errata/RHSA-2026:30814
- https://access.redhat.com/security/cve/CVE-2026-56210
- https://aomedia.googlesource.com/aom/+/a93ba0ffaa
- https://bugzilla.redhat.com/show_bug.cgi?id=2490801
- https://issues.chromium.org/issues/503975732
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56210.json
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