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Purlpkg:deb/debian/ruby-websocket-extensions@0.1.5-2?distro=trixie
Typedeb
Namespacedebian
Nameruby-websocket-extensions
Version0.1.5-2
Qualifiers
distro trixie
Subpath
Is_vulnerablefalse
Next_non_vulnerable_versionnull
Latest_non_vulnerable_versionnull
Affected_by_vulnerabilities
Fixing_vulnerabilities
0
url VCID-u29q-3x9x-73da
vulnerability_id VCID-u29q-3x9x-73da
summary 
Regular Expression Denial of Service in websocket-extensions (RubyGem)
### 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 0.1.5.

### 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-2020-7663.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-2020-7663.json
1
reference_url https://api.first.org/data/v1/epss?cve=CVE-2020-7663
reference_id
reference_type
scores
0
value 0.0242
scoring_system epss
scoring_elements 0.85151
published_at 2026-04-18T12:55:00Z
1
value 0.0242
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scoring_elements 0.85148
published_at 2026-04-16T12:55:00Z
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published_at 2026-04-13T12:55:00Z
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value 0.0242
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scoring_elements 0.85055
published_at 2026-04-01T12:55:00Z
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value 0.0242
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published_at 2026-04-12T12:55:00Z
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value 0.0242
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published_at 2026-04-11T12:55:00Z
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url https://api.first.org/data/v1/epss?cve=CVE-2020-7663
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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7663
reference_id
reference_type
scores
url https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-7663
4
reference_url https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
reference_id
reference_type
scores
0
value 4.3
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
url https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
5
reference_url https://github.com/faye/websocket-extensions-ruby
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-ruby
6
reference_url https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b
reference_id
reference_type
scores
0
value 8.2
scoring_system cvssv3.1
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1
value HIGH
scoring_system generic_textual
scoring_elements
url https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b
7
reference_url https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2
reference_id
reference_type
scores
0
value 7.5
scoring_system cvssv3
scoring_elements
1
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
2
value HIGH
scoring_system cvssv3.1_qr
scoring_elements
3
value HIGH
scoring_system generic_textual
scoring_elements
url https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2
8
reference_url https://github.com/rubysec/ruby-advisory-db/blob/master/gems/websocket-extensions/CVE-2020-7663.yml
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/rubysec/ruby-advisory-db/blob/master/gems/websocket-extensions/CVE-2020-7663.yml
9
reference_url https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html
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://lists.debian.org/debian-lts-announce/2020/08/msg00031.html
10
reference_url https://nvd.nist.gov/vuln/detail/CVE-2020-7663
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-2020-7663
11
reference_url https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830
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-RUBY-WEBSOCKETEXTENSIONS-570830
12
reference_url https://usn.ubuntu.com/4502-1
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://usn.ubuntu.com/4502-1
13
reference_url https://usn.ubuntu.com/4502-1/
reference_id
reference_type
scores
url https://usn.ubuntu.com/4502-1/
14
reference_url https://bugzilla.redhat.com/show_bug.cgi?id=1845978
reference_id 1845978
reference_type
scores
url https://bugzilla.redhat.com/show_bug.cgi?id=1845978
15
reference_url https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964274
reference_id 964274
reference_type
scores
url https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964274
16
reference_url https://github.com/advisories/GHSA-g6wq-qcwm-j5g2
reference_id GHSA-g6wq-qcwm-j5g2
reference_type
scores
0
value HIGH
scoring_system cvssv3.1_qr
scoring_elements
url https://github.com/advisories/GHSA-g6wq-qcwm-j5g2
17
reference_url https://access.redhat.com/errata/RHSA-2020:4366
reference_id RHSA-2020:4366
reference_type
scores
url https://access.redhat.com/errata/RHSA-2020:4366
fixed_packages
0
url pkg:deb/debian/ruby-websocket-extensions@0.1.5-1?distro=trixie
purl pkg:deb/debian/ruby-websocket-extensions@0.1.5-1?distro=trixie
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:deb/debian/ruby-websocket-extensions@0.1.5-1%3Fdistro=trixie
1
url pkg:deb/debian/ruby-websocket-extensions@0.1.5-2?distro=trixie
purl pkg:deb/debian/ruby-websocket-extensions@0.1.5-2?distro=trixie
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:deb/debian/ruby-websocket-extensions@0.1.5-2%3Fdistro=trixie
aliases CVE-2020-7663, GHSA-g6wq-qcwm-j5g2
risk_score 4.0
exploitability 0.5
weighted_severity 8.0
resource_url http://public2.vulnerablecode.io/vulnerabilities/VCID-u29q-3x9x-73da
Risk_scorenull
Resource_urlhttp://public2.vulnerablecode.io/packages/pkg:deb/debian/ruby-websocket-extensions@0.1.5-2%3Fdistro=trixie