What’s Vulnerable › Vulnerabilities

CVE-2026-89090: Denial of service in the event stream header decoder in AWS SDK for Go v2

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-09-11
• Weakness: CWE-248

Description

An unrecovered panic in the event stream header decoder in Amazon AWS SDK for Go v2 before release-2026-03-23 might allow an unauthenticated remote actor to terminate the consuming application process via a crafted event stream response frame containing a header value type outside the valid range. To remediate this issue, users should upgrade to release-2026-03-23 or later, and patch any forked or derivative code.

Affected products

• AWS SDK for Go v2: before 2026-03-23 — fixed in 2026-03-23

How to fix

Upgrade to a fixed version: AWS SDK for Go v2 2026-03-23. Check the vendor advisory for mitigations.

References

• https://aws.amazon.com/security/security-bulletins/2026-110-aws/
• https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2026-03-23
• https://github.com/aws/aws-sdk-go-v2/security/advisories/GHSA-xmrv-pmrh-hhx2

Get alerted when CVE-2026-89090 or the next vulnerability affects your stack