CVE-2026-89090CWE-248

CVE-2026-89090

Medium · published September 11, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
22.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.2 · CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00305 · 22.1th percentile
Weakness
CWE-248 · Uncaught Exception
Published
2026-09-11T22:17Z
References (3)
https://aws.amazon.com/security/security-bulletins/2026-110-aws/ · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/aws/aws-sdk-go-v2/releases/tag/release-2026-03-23 · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/aws/aws-sdk-go-v2/security/advisories/GHSA-xmrv-pmrh-hhx2 · ff89ba41-3aa1-4d27-914a-91399e9639e5
EPSS history
Timeline
  • 13 SEP 03:23Z
    EPSS moved — → 0%
    epss
  • 11 SEP 17:03Z
    Denial of service in the event stream header decoder in AWS SDK for Go v2
    cvelistv5