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Medium, CVSS 6.9Exploited · CISA KEVamended

HTTP/2 Stream Cancellation Attack

CVE-2023-44487GHSA-qppj-fm5r-hxr3

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Maven com.typesafe.akka:akka-http-core_2.13

    Affected
    < 10.5.3
    Fixed in
    10.5.3

  • runtime node

    Affected
    >= 18.0.0, < 18.18.2>= 20.0.0, < 20.8.1
    Fixed in
    20.8.1, 18.18.2

  • Maven com.typesafe.akka:akka-http-core

    Affected
    < 10.5.3
    Fixed in
    10.5.3

  • Maven org.eclipse.jetty.http2:jetty-http2-common

    Affected
    >= 12.0.0, < 12.0.2
    Fixed in
    12.0.2

  • Maven org.eclipse.jetty.http2:http2-common

    Affected
    >= 9.3.0, < 9.4.53>= 10.0.0, < 10.0.17>= 11.0.0, < 11.0.17
    Fixed in
    11.0.17, 9.4.53, 10.0.17

  • Maven com.typesafe.akka:akka-http-core_2.12

    Affected
    < 10.5.3
    Fixed in
    10.5.3

  • Maven org.apache.tomcat:tomcat-coyote

    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
    10.1.14, 9.0.81, 11.0.0-M12, 8.5.94

  • Go golang.org/x/net

    Affected
    < 0.17.0
    Fixed in
    0.17.0

  • Maven com.typesafe.akka:akka-http-core_2.11

    Affected
    <= 10.1.15
    Fixed in
    no fixed version recorded

  • Maven org.eclipse.jetty.http2:jetty-http2-server

    Affected
    >= 12.0.0, < 12.0.2
    Fixed in
    12.0.2

  • Maven org.apache.tomcat.embed:tomcat-embed-core

    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
    10.1.14, 9.0.81, 11.0.0-M12, 8.5.94

  • Maven org.eclipse.jetty.http2:http2-server

    Affected
    >= 9.3.0, < 9.4.53>= 10.0.0, < 10.0.17>= 11.0.0, < 11.0.17
    Fixed in
    11.0.17, 9.4.53, 10.0.17

Sources

  • raw.githubusercontent.com runtime security intelligence

    Node.js security working group core entry 126 lists CVE-2023-44487 affecting node >=18.0.0 =20.0.0 <20.8.1

    VerifiedObserved Structured Node.js security-wg core vulnerability record maintained by the Node.js project.

  • nodejs.org runtime security intelligence

    The nodejs.org release index dates the first patched release for CVE-2023-44487 to 2023-10-13.

    VerifiedObserved Official nodejs.org release index (dist/index.json).

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-qppj-fm5r-hxr3 lists affected ranges: Go golang.org/x/net >=0 =11.0.0-M1 =10.0.0 =9.0.0 =8.5.0 =9.3.0 =10.0.0 =11.0.0 =9.3.0 =10.0.0 =11.0.0 =12.0.0 <12.0.2; Maven…

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

  • CISA Known Exploited Vulnerabilities Catalog

    CISA added CVE-2023-44487 to the Known Exploited Vulnerabilities catalog on 2023-10-10.

    VerifiedObserved Listed in the CISA KEV JSON feed (dateAdded 2023-10-10).

Severity and exploitation
Exploitation
Confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
CVSS 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:A · score source
EPSS
  • CVE-2023-44487: 100.00% estimated exploitation activity in the next 30 days; percentile 100.00 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

HTTP/2 Rapid reset attack The HTTP/2 protocol allows clients to indicate to the server that a previous stream should be canceled by sending a RSTSTREAM frame. The protocol does not require the client and server to coordinate the cancellation in any way, the client may do it unilaterally. The client may also assume that the cancellation will take effect immediately when the server receives the RSTSTREAM frame, before any other data from that TCP connection is processed. Abuse of this feature is called a Rapid Reset attack because it relies on the ability for an endpoint to send a RSTSTREAM frame immediately after sending a request frame, which makes the other endpoint start working and then rapidly resets the request. The request is canceled, but leaves the HTTP/2 connection open. The HTTP/2 Rapid Reset attack built on this capability is simple: The client opens a large number of streams at once as in the standard HTTP/2 attack, but rather than waiting for a response to each request…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from vendor_advisory record nodejs-security-wg:core:126

  2. Revision 2 · published ·

    Published from ghsa record GHSA-qppj-fm5r-hxr3

  3. Revision 1 · created ·

    Created from vendor_advisory record nodejs-security-wg:core:126

Agent brief

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# Patch Next advisory brief: CVE-2023-44487

Advisory: HTTP/2 Stream Cancellation Attack
IDs: CVE-2023-44487, GHSA-qppj-fm5r-hxr3
Record: https://patchnext.com/advisories/cve-2023-44487 (revision 3, source checked 26 Oct 2026, 16:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: confirmed: listed in the CISA Known Exploited Vulnerabilities catalog.
Vendor response: Partial vendor fix; fixed versions by package: com.typesafe.akka:akka-http-core_2.13 10.5.3; node 20.8.1, 18.18.2; com.typesafe.akka:akka-http-core 10.5.3; org.eclipse.jetty.http2:jetty-http2-common 12.0.2; org.eclipse.jetty.http2:http2-common 11.0.17, 10.0.17, 9.4.53; com.typesafe.akka:akka-http-core_2.12 10.5.3; org.apache.tomcat:tomcat-coyote 11.0.0-M12, 10.1.14, 9.0.81, 8.5.94; golang.org/x/net 0.17.0; org.eclipse.jetty.http2:jetty-http2-server 12.0.2; org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M12, 10.1.14, 9.0.81, 8.5.94; org.eclipse.jetty.http2:http2-server 11.0.17, 10.0.17, 9.4.53. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven com.typesafe.akka:akka-http-core_2.13: affected < 10.5.3; fixed in 10.5.3
- runtime node: affected >= 18.0.0, < 18.18.2; >= 20.0.0, < 20.8.1; fixed in 20.8.1, 18.18.2
- Maven com.typesafe.akka:akka-http-core: affected < 10.5.3; fixed in 10.5.3
- Maven org.eclipse.jetty.http2:jetty-http2-common: affected >= 12.0.0, < 12.0.2; fixed in 12.0.2
- Maven org.eclipse.jetty.http2:http2-common: affected >= 9.3.0, < 9.4.53; >= 10.0.0, < 10.0.17; >= 11.0.0, < 11.0.17; fixed in 11.0.17, 9.4.53, 10.0.17
- Maven com.typesafe.akka:akka-http-core_2.12: affected < 10.5.3; fixed in 10.5.3
- Maven org.apache.tomcat:tomcat-coyote: 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 10.1.14, 9.0.81, 11.0.0-M12, 8.5.94
- Go golang.org/x/net: affected < 0.17.0; fixed in 0.17.0
- Maven com.typesafe.akka:akka-http-core_2.11: affected <= 10.1.15
- Maven org.eclipse.jetty.http2:jetty-http2-server: affected >= 12.0.0, < 12.0.2; fixed in 12.0.2
- Maven org.apache.tomcat.embed:tomcat-embed-core: 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 10.1.14, 9.0.81, 11.0.0-M12, 8.5.94
- Maven org.eclipse.jetty.http2:http2-server: affected >= 9.3.0, < 9.4.53; >= 10.0.0, < 10.0.17; >= 11.0.0, < 11.0.17; fixed in 11.0.17, 9.4.53, 10.0.17

## Suggested inspection (read-only)
- Maven com.typesafe.akka:akka-http-core_2.13: check the installed version with your package manager.
- runtime node: check the installed version with your package manager.
- Maven com.typesafe.akka:akka-http-core: check the installed version with your package manager.
- Maven org.eclipse.jetty.http2:jetty-http2-common: check the installed version with your package manager.
- Maven org.eclipse.jetty.http2:http2-common: check the installed version with your package manager.
- Maven com.typesafe.akka:akka-http-core_2.12: check the installed version with your package manager.
- Maven org.apache.tomcat:tomcat-coyote: check the installed version with your package manager.
- Go golang.org/x/net: check the installed version with your package manager.
- Maven com.typesafe.akka:akka-http-core_2.11: check the installed version with your package manager.
- Maven org.eclipse.jetty.http2:jetty-http2-server: check the installed version with your package manager.
- Maven org.apache.tomcat.embed:tomcat-embed-core: check the installed version with your package manager.
- Maven org.eclipse.jetty.http2:http2-server: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on com.typesafe.akka:akka-http-core_2.13, node, com.typesafe.akka:akka-http-core, org.eclipse.jetty.http2:jetty-http2-common, org.eclipse.jetty.http2:http2-common, com.typesafe.akka:akka-http-core_2.12, org.apache.tomcat:tomcat-coyote, golang.org/x/net, com.typesafe.akka:akka-http-core_2.11, org.eclipse.jetty.http2:jetty-http2-server, org.apache.tomcat.embed:tomcat-embed-core, org.eclipse.jetty.http2:http2-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://raw.githubusercontent.com/nodejs/security-wg/main/vuln/core/126.json (Node.js security working group core entry 126 lists CVE-2023-44487 affecting node >=18.0.0 =20.0.0 <20.8.1)
- Verified: https://nodejs.org/dist/index.json (The nodejs.org release index dates the first patched release for CVE-2023-44487 to 2023-10-13.)
- Verified: https://github.com/advisories/GHSA-qppj-fm5r-hxr3 (GitHub-reviewed advisory GHSA-qppj-fm5r-hxr3 lists affected ranges: Go golang.org/x/net >=0 =11.0.0-M1 =10.0.0 =9.0.0 =8.5.0 =9.3.0 =10.0.0 =11.0.0 =9.3.0 =10.0.0 =11.0.0 =12.0.0 <12.0.2; Maven…)
- Verified: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CISA added CVE-2023-44487 to the Known Exploited Vulnerabilities catalog on 2023-10-10.)

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