HighFix available
ruby — security advisory
An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.
- Products
- ruby
- Affected versions
- Not specified
- Fixed versions
- 2.5.8-r1, 2.6.6-r3, 2.7.2-r0
- CVEs
- CVE-2020-25613
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:08 UTC · Revision 1
Source evidence
An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.
osv:ALPINE-CVE-2020-25613
ruby
Fixed versions: 2.5.8-r1
ruby
Fixed versions: 2.6.6-r3
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
ruby
Fixed versions: 2.7.2-r0
Complete source record
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],
"modified": "2026-10-26T11:17:55.154529114Z",
"provider": "osv",
"upstream": [
"CVE-2020-25613"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-25613"
]
},
"related_cves": [
{
"value": "CVE-2020-25613",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450540,
"published_at": "2020-10-06T13:15:13.823+00:00"
}