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No exploitation reportedFix available

CVE-2018-1000518

No exploitation reported by the sources we read.

  • Published2018-06-26
  • Fixed in5.0
  • WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

aaugustin websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in 5.

Timeline

dates in UTC
  1. 2018-06-2616:29CVE publishedNVD

Versions per branch

OSV · NVD
websockets
BranchAffectedFixed in
5.0< 5.05.0
5.0≥ 4.0, < 5.05.0
Websockets project websockets
BranchAffectedFixed in
4.0= 4.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • azure-cli-coreSUSE:Linux Enterprise Module for Public Cloud 15 SP5all versions · fixed in 2.17.1-150100.6.18.1
  • azure-cli-coreSUSE:Linux Enterprise Module for Public Cloud 15 SP4all versions · fixed in 2.17.1-150100.6.18.1
  • azure-cli-coreSUSE:Linux Enterprise Module for Public Cloud 15 SP3all versions · fixed in 2.17.1-150100.6.18.1
  • azure-cli-coreSUSE:Linux Enterprise Module for Public Cloud 15 SP2all versions · fixed in 2.17.1-150100.6.18.1
  • azure-cli-coreSUSE:Linux Enterprise Module for Public Cloud 15 SP1all versions · fixed in 2.17.1-150100.6.18.1
  • azure-cli-coreopenSUSE:Leap 15.4all versions · fixed in 2.17.1-150100.6.18.1
  • grpcSUSE:Linux Enterprise Module for Public Cloud 15 SP1all versions · fixed in 1.25.0-150100.3.3.3
  • protobufSUSE:Linux Enterprise Server for SAP Applications 15 SP1all versions · fixed in 3.9.2-150100.8.3.3

186 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-1000518 Red Hat Product Security

    python-websockets: Improper handling of highly compressed data

Full record on NVD

Fix

  1. Update websockets to 5.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2018-06-26
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-6g87-ff9q-v847

Frequently asked questions

What is CVE-2018-1000518?

aaugustin websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in 5.

Is CVE-2018-1000518 actively exploited?

Active exploitation of CVE-2018-1000518 has not been confirmed. Its EPSS score was 1.8% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-1000518?

CVE-2018-1000518 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record