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Unratedamended

HTTP/2 DoS Attacks: Ping, Reset, and Settings Floods

GHSA-32gv-6cf3-wcmq

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (twisted 19.10.0), redeploy, then verify what is actually installed.

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

  • PyPI twisted

    Affected
    < 19.10.0
    Fixed in
    19.10.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Impact Twisted web servers that utilize the optional HTTP/2 support suffer from the following flow-control related vulnerabilities: Ping flood: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9512 Reset flood: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9514 Settings flood: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9515 A Twisted web server supports HTTP/2 requests if you've installed the http2 optional dependency set. Workarounds There are no workarounds. References https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md For more information If you have any questions or comments about this advisory: Open an issue in Twisted's Trac

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-32gv-6cf3-wcmq

  2. Revision 1 · created ·

    Published from osv record GHSA-32gv-6cf3-wcmq

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-32gv-6cf3-wcmq

Advisory: HTTP/2 DoS Attacks: Ping, Reset, and Settings Floods
IDs: GHSA-32gv-6cf3-wcmq
Record: https://patchnext.com/advisories/ghsa-32gv-6cf3-wcmq (revision 2, source checked 26 Oct 2026, 13:12 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: twisted 19.10.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI twisted: affected < 19.10.0; fixed in 19.10.0

## Suggested inspection (read-only)
- `python -m pip show twisted`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on twisted.
- 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?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-32gv-6cf3-wcmq (OSV record GHSA-32gv-6cf3-wcmq lists affected ranges: PyPI twisted >=0 <19.10.0 (fixed))
- Verified: https://github.com/advisories/GHSA-32gv-6cf3-wcmq (GitHub-reviewed advisory GHSA-32gv-6cf3-wcmq lists affected ranges: PyPI twisted >=0 <19.10.0)

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