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Package Instance

Lookup for vulnerable packages by Package URL.

Purlpkg:npm/websocket-extensions@0.1.1
Typenpm
Namespace
Namewebsocket-extensions
Version0.1.1
Qualifiers
Subpath
Is_vulnerabletrue
Next_non_vulnerable_version0.1.4
Latest_non_vulnerable_version0.1.4
Affected_by_vulnerabilities
0
url VCID-gg1m-2vwq-euet
vulnerability_id VCID-gg1m-2vwq-euet
summary 
Regular Expression Denial of Service in websocket-extensions (NPM package)
### Impact

The ReDoS flaw allows an attacker to exhaust the server's capacity to process
incoming requests by sending a WebSocket handshake request containing a header
of the following form:

    Sec-WebSocket-Extensions: a; b="\c\c\c\c\c\c\c\c\c\c ...

That is, a header containing an unclosed string parameter value whose content is
a repeating two-byte sequence of a backslash and some other character. The
parser takes exponential time to reject this header as invalid, and this will
block the processing of any other work on the same thread. Thus if you are
running a single-threaded server, such a request can render your service
completely unavailable.

### Patches

Users should upgrade to version 0.1.4.

### Workarounds

There are no known work-arounds other than disabling any public-facing
WebSocket functionality you are operating.

### References

- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/
references
0
reference_url https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-7662.json
reference_id
reference_type
scores
0
value 7.5
scoring_system cvssv3
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
url https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-7662.json
1
reference_url https://api.first.org/data/v1/epss?cve=CVE-2020-7662
reference_id
reference_type
scores
0
value 0.00304
scoring_system epss
scoring_elements 0.53683
published_at 2026-04-21T12:55:00Z
1
value 0.00304
scoring_system epss
scoring_elements 0.537
published_at 2026-04-18T12:55:00Z
2
value 0.00304
scoring_system epss
scoring_elements 0.53696
published_at 2026-04-16T12:55:00Z
3
value 0.00304
scoring_system epss
scoring_elements 0.53658
published_at 2026-04-13T12:55:00Z
4
value 0.00304
scoring_system epss
scoring_elements 0.53675
published_at 2026-04-12T12:55:00Z
5
value 0.00304
scoring_system epss
scoring_elements 0.53573
published_at 2026-04-01T12:55:00Z
6
value 0.00304
scoring_system epss
scoring_elements 0.53643
published_at 2026-04-09T12:55:00Z
7
value 0.00304
scoring_system epss
scoring_elements 0.53645
published_at 2026-04-08T12:55:00Z
8
value 0.00304
scoring_system epss
scoring_elements 0.53593
published_at 2026-04-07T12:55:00Z
9
value 0.00304
scoring_system epss
scoring_elements 0.53624
published_at 2026-04-04T12:55:00Z
10
value 0.00304
scoring_system epss
scoring_elements 0.53596
published_at 2026-04-02T12:55:00Z
11
value 0.00304
scoring_system epss
scoring_elements 0.53692
published_at 2026-04-11T12:55:00Z
url https://api.first.org/data/v1/epss?cve=CVE-2020-7662
2
reference_url https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
reference_id
reference_type
scores
0
value 8.2
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
3
reference_url https://github.com/faye/websocket-extensions-node
reference_id
reference_type
scores
0
value 8.2
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url https://github.com/faye/websocket-extensions-node
4
reference_url https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237
reference_id
reference_type
scores
0
value 8.2
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237
5
reference_url https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv
reference_id
reference_type
scores
0
value 8.2
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
1
value HIGH
scoring_system cvssv3.1_qr
scoring_elements
2
value HIGH
scoring_system generic_textual
scoring_elements
url https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv
6
reference_url https://nvd.nist.gov/vuln/detail/CVE-2020-7662
reference_id
reference_type
scores
0
value 8.2
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url https://nvd.nist.gov/vuln/detail/CVE-2020-7662
7
reference_url https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623
reference_id
reference_type
scores
0
value 8.2
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623
8
reference_url https://bugzilla.redhat.com/show_bug.cgi?id=1845982
reference_id 1845982
reference_type
scores
url https://bugzilla.redhat.com/show_bug.cgi?id=1845982
9
reference_url https://github.com/advisories/GHSA-g78m-2chm-r7qv
reference_id GHSA-g78m-2chm-r7qv
reference_type
scores
0
value HIGH
scoring_system cvssv3.1_qr
scoring_elements
url https://github.com/advisories/GHSA-g78m-2chm-r7qv
10
reference_url https://access.redhat.com/errata/RHSA-2020:2796
reference_id RHSA-2020:2796
reference_type
scores
url https://access.redhat.com/errata/RHSA-2020:2796
11
reference_url https://access.redhat.com/errata/RHSA-2020:2861
reference_id RHSA-2020:2861
reference_type
scores
url https://access.redhat.com/errata/RHSA-2020:2861
12
reference_url https://access.redhat.com/errata/RHSA-2020:4298
reference_id RHSA-2020:4298
reference_type
scores
url https://access.redhat.com/errata/RHSA-2020:4298
fixed_packages
0
url pkg:npm/websocket-extensions@0.1.4
purl pkg:npm/websocket-extensions@0.1.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:npm/websocket-extensions@0.1.4
aliases CVE-2020-7662, GHSA-g78m-2chm-r7qv
risk_score 4.0
exploitability 0.5
weighted_severity 8.0
resource_url http://public2.vulnerablecode.io/vulnerabilities/VCID-gg1m-2vwq-euet
Fixing_vulnerabilities
Risk_score4.0
Resource_urlhttp://public2.vulnerablecode.io/packages/pkg:npm/websocket-extensions@0.1.1