AWS Publishes Brotli CVE-2026-111497 Mitigation Status
Tech GuruQuick Answer
AWS bulletin 2026-155-AWS tracks CVE-2026-111497 across AWS-provided runtimes and images. Inventory exact services and artifacts, follow the live status table, rebuild and redeploy patched images, validate workloads, and retain dependency and deployment evidence.
Confirm Scope And Apply The Supported Remediation
What to do now: Inventory Lambda runtimes and deployment packages, CodeBuild and other service-provided images, notebooks, containers, AMIs, Node.js and .NET versions, direct Brotli dependencies, owners, regions, and deployment pipelines. Match each workload to the live AWS service status and distinguish the managed service from its runtimes or customer code; do not infer exposure where Brotli is absent or a patched artifact is active. Use AWS's updated runtime or image when available, rebuild and redeploy pinned or custom artifacts, update direct Brotli dependencies, and follow service-specific instructions and completion targets in the bulletin. Confirm active runtime and image digests, dependency versions and regional rollout, run representative builds and workloads, monitor failed deployments, and retain software-bill, image and deployment evidence.
Last verified: 2026-10-29 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | AWS-provided runtimes, base images, build images, notebooks, and customer workloads using vulnerable Brotli decoding |
|---|---|
| Advisory | 2026-155-AWS |
| CVE | CVE-2026-111497 |
| Authoritative release date | 2026-10-28 22:00:00 UTC |
| Authority revision date | 2026-10-28 22:00:00 UTC |
| Affected versions | The service-specific runtimes and images listed in AWS bulletin 2026-155-AWS, plus customer deployments that include vulnerable Brotli versions; the AWS Lambda managed service itself is not affected. |
| Fixed version | Follow the live AWS service table, rebuild and redeploy with patched runtimes or images, and update vulnerable Brotli dependencies in customer-managed workloads |
| CVSS base score | Not provided by the authority |
| CVSS severity | Not provided by the authority |
| Exploitation status | AWS does not state in this bulletin that CVE-2026-111497 is being maliciously exploited in AWS services or customer workloads.; no exploitation claim is inferred. |
What Changed
AWS published mitigation and rollout status for the Brotli out-of-bounds write behind CVE-2026-111497 across service-provided runtimes, base images, build environments, notebooks, and customer-managed deployments.
What To Validate Now
- Inventory. Inventory Lambda runtimes and deployment packages, CodeBuild and other service-provided images, notebooks, containers, AMIs, Node.js and .NET versions, direct Brotli dependencies, owners, regions, and deployment pipelines.
- Establish applicability. Match each workload to the live AWS service status and distinguish the managed service from its runtimes or customer code; do not infer exposure where Brotli is absent or a patched artifact is active.
- Remediate. Use AWS's updated runtime or image when available, rebuild and redeploy pinned or custom artifacts, update direct Brotli dependencies, and follow service-specific instructions and completion targets in the bulletin.
- Validate. Confirm active runtime and image digests, dependency versions and regional rollout, run representative builds and workloads, monitor failed deployments, and retain software-bill, image and deployment evidence.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
The bulletin contains staged rollout targets after this monitor window and may change. Recheck it before closing remediation, and do not treat a provider image update as proof that pinned or already-deployed customer artifacts were rebuilt.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
