# HTTP/2 Stream Cancellation Attack

Advisory record · `GHSA-qppj-fm5r-hxr3`

- **Identifiers:** `GHSA-qppj-fm5r-hxr3` · `BIT-apisix-2023-44487` · `BIT-aspnet-core-2023-44487` · `BIT-contour-2023-44487` · `BIT-dotnet-2023-44487` · `BIT-dotnet-sdk-2023-44487` · `BIT-envoy-2023-44487` · `BIT-golang-2023-44487` · `BIT-jenkins-2023-44487` · `BIT-kong-2023-44487` · `BIT-nginx-2023-44487` · `BIT-nginx-gateway-2023-44487` · `BIT-node-2023-44487` · `BIT-node-min-2023-44487` · `BIT-solr-2023-44487` · `BIT-tomcat-2023-44487` · `BIT-varnish-2023-44487` · `CVE-2023-44487`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** Yes: KEV
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 10 Oct 2023
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 10 Oct 2023, 21:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- In CISA’s KEV catalogue since 10 Oct 2023: it is known to be exploited.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `golang.org/x/net` (Go): affected `<0.17.0`; fixed in `0.17.0`
- `org.apache.tomcat:tomcat-coyote` (Maven): affected `>=11.0.0-M1, <11.0.0-M12 || >=10.0.0, <10.1.14 || >=9.0.0, <9.0.81 || >=8.5.0, <8.5.94`; fixed in `11.0.0-M12`, `10.1.14`, `9.0.81`, `8.5.94`
- `org.apache.tomcat.embed:tomcat-embed-core` (Maven): affected `>=11.0.0-M1, <11.0.0-M12 || >=10.0.0, <10.1.14 || >=9.0.0, <9.0.81 || >=8.5.0, <8.5.94`; fixed in `11.0.0-M12`, `10.1.14`, `9.0.81`, `8.5.94`
- `org.eclipse.jetty.http2:http2-common` (Maven): affected `>=9.3.0, <9.4.53 || >=10.0.0, <10.0.17 || >=11.0.0, <11.0.17`; fixed in `9.4.53`, `10.0.17`, `11.0.17`
- `org.eclipse.jetty.http2:http2-server` (Maven): affected `>=9.3.0, <9.4.53 || >=10.0.0, <10.0.17 || >=11.0.0, <11.0.17`; fixed in `9.4.53`, `10.0.17`, `11.0.17`
- `org.eclipse.jetty.http2:jetty-http2-common` (Maven): affected `>=12.0.0, <12.0.2`; fixed in `12.0.2`
- `org.eclipse.jetty.http2:jetty-http2-server` (Maven): affected `>=12.0.0, <12.0.2`; fixed in `12.0.2`
- `com.typesafe.akka:akka-http-core` (Maven): affected `<10.5.3`; fixed in `10.5.3`
- `com.typesafe.akka:akka-http-core_2.13` (Maven): affected `<10.5.3`; fixed in `10.5.3`
- `com.typesafe.akka:akka-http-core_2.12` (Maven): affected `<10.5.3`; fixed in `10.5.3`
- `com.typesafe.akka:akka-http-core_2.11` (Maven): affected `<=10.1.15`; no fixed version yet

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:H`, from GitHub Advisory Database

- **CISA KEV:** Listed since 10 Oct 2023: known to be exploited.
- **EPSS:** 1.00, the 99th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:15 UTC: First seen by agentprime
- 31 Oct 2026, 14:15 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qppj-fm5r-hxr3)

## Sources

- [GitHub Advisory Database: GHSA-qppj-fm5r-hxr3](https://github.com/advisories/GHSA-qppj-fm5r-hxr3)
- [OSV: GHSA-qppj-fm5r-hxr3](https://osv.dev/vulnerability/GHSA-qppj-fm5r-hxr3)
- <https://github.com/apple/swift-nio-http2/security/advisories/GHSA-qppj-fm5r-hxr3>
- <https://github.com/h2o/h2o/security/advisories/GHSA-2m7v-gc89-fjqf>
- <https://nvd.nist.gov/vuln/detail/CVE-2023-44487>
- <https://github.com/alibaba/tengine/issues/1872>
- <https://github.com/apache/apisix/issues/10320>
- <https://github.com/akka/akka-http/issues/4323>
- <https://github.com/varnishcache/varnish-cache/issues/3996>
- <https://github.com/tempesta-tech/tempesta/issues/1986>
- <https://github.com/Azure/AKS/issues/3947>
- <https://github.com/opensearch-project/data-prepper/issues/3474>
- <https://github.com/caddyserver/caddy/issues/5877>
- <https://github.com/openresty/openresty/issues/930>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-qppj-fm5r-hxr3>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-qppj-fm5r-hxr3/>. Everything for agents: <https://agentprime.io/llms.txt>.