Medium
Security advisory
In RubyGem excon before 0.71.0, there was a race condition around persistent connections, where a connection which is interrupted (such as by a timeout) would leave data on the socket. Subsequent requests would then read this data, returning content from the previous response. The race condition window appears to be short, and it would be difficult to purposefully exploit this.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-16779
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:02 UTC · Revision 1
Source evidence
In RubyGem excon before 0.71.0, there was a race condition around persistent connections, where a connection which is interrupted (such as by a timeout) would leave data on the socket. Subsequent requests would then read this data, returning content from the previous response. The race condition window appears to be short, and it would be difficult to purposefully exploit this.
osv:CVE-2019-16779
Complete source record
{
"id": "d4807597dc8f3bf69f5b16d2a2583af71aa945c1a041667f33ce1aad2e6c86b9",
"url": "https://osv.dev/vulnerability/CVE-2019-16779",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-16779",
"summary": "In RubyGem excon before 0.71.0, there was a race condition around persistent connections, where a connection which is interrupted (such as by a timeout) would leave data on the socket. Subsequent requests would then read this data, returning content from the previous response. The race condition window appears to be short, and it would be difficult to purposefully exploit this.",
"evidence": "osv:CVE-2019-16779",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2019-16779",
"aliases": [
"CVE-2019-16779",
"GHSA-q58g-455p-8vw9"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/excon/excon",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "1149d44d921660bcde5e21671e6a10346d177f33"
},
{
"fixed": "ccb57d7a422f020dc74f1de4e8fb505ab46d8a29"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:excon_project:excon:*:*:*:*:*:ruby:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.71.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "ccb57d7a422f020dc74f1de4e8fb505ab46d8a29"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v0.70.0",
"v0.69.1",
"v0.69.0",
"v0.68.0",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-16779.json"
}
}
],
"modified": "2026-10-20T10:52:28.165036146Z",
"provider": "osv",
"references": [
"https://github.com/excon/excon/security/advisories/GHSA-q58g-455p-8vw9",
"https://lists.debian.org/debian-lts-announce/2020/01/msg00015.html",
"https://github.com/excon/excon/commit/ccb57d7a422f020dc74f1de4e8fb505ab46d8a29"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:*"
],
"vendor_product": "opensuse:backports_sle",
"extracted_events": [
{
"range": [
{
"introduced": "15.0-sp1"
},
{
"last_affected": "15.0-sp1"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-16779",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 383663,
"published_at": "2019-12-16T20:15:15.54+00:00"
}