CVE-2026-56211: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-qr4p-j2pf-4w4x
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CVSS 7.1
CWE-787
Published
Advisory Summary

CVE-2026-56211 is a HIGH (CVSS 7.1) security vulnerability vulnerability (CWE-787: Out-of-bounds Write) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product writes data past the end, or before the beginning, of the intended buffer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-56211 at a Glance

CVE Identifier CVE-2026-56211
GHSA Identifier GHSA-qr4p-j2pf-4w4x
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-787: Out-of-bounds Write
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-56211

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-56211, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A remote code execution vulnerability was found in libaom, the reference AV1 codec implementation. Insufficient bounds validation in the AV1 encoder's SVC (Scalable Video Coding) layer ID control allows an attacker to supply crafted video frame pixels that overlap with internal encoder layer context structures. In fork-based video processing services, an attacker can use this to hijack the cyclic refresh map pointer, brute-force the process base address via a crash oracle, and redirect control flow to achieve arbitrary command execution. Exploitation requires the target service to use libaom with SVC encoding enabled and accept attacker-supplied video frames.

References

NVD — CVE-2026-56211 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56211
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69935
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71392
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71393
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71394
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71395
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71396
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71397
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71398
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71399
access.redhat.com/errata/rhsa-2026:71... WEB
https://access.redhat.com/errata/RHSA-2026:71401
access.redhat.com/errata/rhsa-2026:74... WEB
https://access.redhat.com/errata/RHSA-2026:74771
access.redhat.com/errata/rhsa-2026:75... WEB
https://access.redhat.com/errata/RHSA-2026:75652
access.redhat.com/errata/rhsa-2026:75... WEB
https://access.redhat.com/errata/RHSA-2026:75654
access.redhat.com/errata/rhsa-2026:75... WEB
https://access.redhat.com/errata/RHSA-2026:75657
access.redhat.com/errata/rhsa-2026:75... WEB
https://access.redhat.com/errata/RHSA-2026:75658
access.redhat.com/errata/rhsa-2026:75... WEB
https://access.redhat.com/errata/RHSA-2026:75659
access.redhat.com/errata/rhsa-2026:75... WEB
https://access.redhat.com/errata/RHSA-2026:75660
access.redhat.com/errata/rhsa-2026:76... WEB
https://access.redhat.com/errata/RHSA-2026:76041
access.redhat.com/errata/rhsa-2026:76... WEB
https://access.redhat.com/errata/RHSA-2026:76042
access.redhat.com/errata/rhsa-2026:76... WEB
https://access.redhat.com/errata/RHSA-2026:76043
access.redhat.com/errata/rhsa-2026:84... WEB
https://access.redhat.com/errata/RHSA-2026:84734
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-56211
aomedia.googlesource.com/aom/+/a93ba0ffaa WEB
https://aomedia.googlesource.com/aom/+/a93ba0ffaa
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2490802
issues.chromium.org/issues/503993985 WEB
https://issues.chromium.org/issues/503993985
Software Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56211.json
access.redhat.com/errata/rhsa-2026:30... WEB
https://access.redhat.com/errata/RHSA-2026:30814
access.redhat.com/errata/rhsa-2026:42... WEB
https://access.redhat.com/errata/RHSA-2026:42875
access.redhat.com/errata/rhsa-2026:51... WEB
https://access.redhat.com/errata/RHSA-2026:51100
access.redhat.com/errata/rhsa-2026:51... WEB
https://access.redhat.com/errata/RHSA-2026:51146
access.redhat.com/errata/rhsa-2026:60... WEB
https://access.redhat.com/errata/RHSA-2026:60520
access.redhat.com/errata/rhsa-2026:61... WEB
https://access.redhat.com/errata/RHSA-2026:61627
access.redhat.com/errata/rhsa-2026:61... WEB
https://access.redhat.com/errata/RHSA-2026:61628
access.redhat.com/errata/rhsa-2026:61... WEB
https://access.redhat.com/errata/RHSA-2026:61629
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68634
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68637
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68638
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68639
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68640
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68696
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68697
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68698
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68699
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68708
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68709
access.redhat.com/errata/rhsa-2026:68... WEB
https://access.redhat.com/errata/RHSA-2026:68710
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69927
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69929
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69930
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69931
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69932
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69933
access.redhat.com/errata/rhsa-2026:69... WEB
https://access.redhat.com/errata/RHSA-2026:69934

Frequently Asked Questions

What is CVE-2026-56211?
CVE-2026-56211 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-787: Out-of-bounds Write.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-56211?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-56211?
CVE-2026-56211 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H.
What CWE is associated with CVE-2026-56211?
CVE-2026-56211 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).
How can I check Maven dependencies for CVE-2026-56211?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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