# CVE-2026-73513: ecs-service-connect-agent: Fixed a heap use-after-free where an untrusted upstream could send HTTP/2 response trailers without the END_STREAM fl...

CVE-2026-73513 is fixed in ecs-service-connect-agent on 1 platform by ALAS2023-2026-2149 (version v1.39.1.0-1.amzn2023), released September 14, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-73513
- Priority: High
- CVSS: n/a (important)
- EPSS: 0.0049
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 14, 2026

## Description

Fixed a heap use-after-free where an untrusted upstream could send HTTP/2 response trailers without the END_STREAM flag to an Envoy instance using oghttp2, corrupting stream state and terminating the process.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ecs-service-connect-agent amzn 2023 | v1.39.1.0-1.amzn2023 | [ALAS2023-2026-2149](https://patchblox.com/security/data/fix/linux/alas2023-2026-2149.md) | Sep 14, 2026 |

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Data as of 2026-11-11T13:47:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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