Medium
jruby, ruby2.5 and 4 more products — security advisory
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a "literal" byte count, which is automatically read by the client's receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.
- Products
- jruby, ruby2.5, ruby2.7, ruby3.0, ruby3.2, ruby3.3
- Affected versions
- 1.5.6-5ubuntu1, 1.5.6-6, 1.5.6-7, 1.5.6-9+deb8u2build0.14.04.1~esm2, 1.7.21-2ubuntu4, 1.7.22-1ubuntu1, 2.5.0-4ubuntu1, 2.5.0-4ubuntu4, 2.5.0-5ubuntu1, 2.5.0-6ubuntu1, 2.5.0~preview1-1ubuntu2, 2.5.1-1ubuntu1, 2.5.1-1ubuntu1.1, 2.5.1-1ubuntu1.10, 2.5.1-1ubuntu1.11, 2.5.1-1ubuntu1.12, 2.5.1-1ubuntu1.13, 2.5.1-1ubuntu1.14, 2.5.1-1ubuntu1.15, 2.5.1-1ubuntu1.16, 2.5.1-1ubuntu1.16+esm1, 2.5.1-1ubuntu1.16+esm3, 2.5.1-1ubuntu1.16+esm4, 2.5.1-1ubuntu1.16+esm5, 2.5.1-1ubuntu1.16+esm6, 2.5.1-1ubuntu1.16+esm7, 2.5.1-1ubuntu1.16+esm8, 2.5.1-1ubuntu1.2, 2.5.1-1ubuntu1.4, 2.5.1-1ubuntu1.5, 2.5.1-1ubuntu1.6, 2.5.1-1ubuntu1.7, 2.5.1-1ubuntu1.8, 2.5.1-1ubuntu1.9, 2.7.0-1, 2.7.0-2, 2.7.0-3, 2.7.0-4, 2.7.0-4ubuntu1, 2.7.0-5ubuntu1, 2.7.0-5ubuntu1.1, 2.7.0-5ubuntu1.10, 2.7.0-5ubuntu1.11, 2.7.0-5ubuntu1.12, 2.7.0-5ubuntu1.13, 2.7.0-5ubuntu1.14, 2.7.0-5ubuntu1.15, 2.7.0-5ubuntu1.16, 2.7.0-5ubuntu1.17, 2.7.0-5ubuntu1.18, 2.7.0-5ubuntu1.18+esm1, 2.7.0-5ubuntu1.18+esm3, 2.7.0-5ubuntu1.18+esm4, 2.7.0-5ubuntu1.18+esm5, 2.7.0-5ubuntu1.2, 2.7.0-5ubuntu1.3, 2.7.0-5ubuntu1.4, 2.7.0-5ubuntu1.5, 2.7.0-5ubuntu1.6, 2.7.0-5ubuntu1.7, 2.7.0-5ubuntu1.8, 2.7.0-5ubuntu1.9, 3.0.2-5ubuntu1, 3.0.2-7, 3.0.2-7ubuntu2, 3.0.2-7ubuntu2.1, 3.0.2-7ubuntu2.10, 3.0.2-7ubuntu2.11, 3.0.2-7ubuntu2.12, 3.0.2-7ubuntu2.13, 3.0.2-7ubuntu2.2, 3.0.2-7ubuntu2.3, 3.0.2-7ubuntu2.4, 3.0.2-7ubuntu2.5, 3.0.2-7ubuntu2.6, 3.0.2-7ubuntu2.7, 3.0.2-7ubuntu2.8, 3.2.3-1, 3.2.3-1build2, 3.2.3-1build3, 3.2.3-1ubuntu0.24.04.1, 3.2.3-1ubuntu0.24.04.3, 3.2.3-1ubuntu0.24.04.5, 3.2.3-1ubuntu0.24.04.6, 3.2.3-1ubuntu0.24.04.7, 3.2.3-1ubuntu0.24.04.8, 3.3.7-1ubuntu2, 3.3.8-2.2ubuntu4, 3.3.8-2ubuntu1, 3.3.8-2ubuntu2, 3.3.8-2ubuntu2.1, 3.3.8-2ubuntu3, 3.3.8-2ubuntu3.1, 9.1.13.0-1, 9.1.17.0-1~18.04, 9.1.17.0-3, 9.1.17.0-3build5, 9.1.17.0-3build6, 9.3.9.0+ds-1, 9.4.14.0+ds-1, 9.4.5.0+ds-1, 9.4.5.0+ds-1ubuntu1, 9.4.6.0+ds-1ubuntu3, 9.4.8.0+ds-2ubuntu1, 9.4.8.0+ds-3ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2025-43857
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:32 UTC · Revision 1
Source evidence
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a "literal" byte count, which is automatically read by the client's receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.
osv:UBUNTU-CVE-2025-43857
jruby
Fixed versions: Not specified
jruby
Fixed versions: Not specified
ruby2.5
Fixed versions: Not specified
jruby
Fixed versions: Not specified
ruby2.7
Fixed versions: Not specified
jruby
Fixed versions: Not specified
ruby3.0
Fixed versions: Not specified
jruby
Fixed versions: Not specified
ruby3.2
Fixed versions: Not specified
jruby
Fixed versions: Not specified
ruby3.3
Fixed versions: Not specified
jruby
Fixed versions: Not specified
ruby3.3
Fixed versions: Not specified
jruby
Fixed versions: Not specified
ruby3.3
Fixed versions: Not specified
Complete source record
{
"id": "125db17735439c2fa0a0b52ace7c4bf702ed93298e9212f7c6a1e942a88d1854",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-43857",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-43857",
"summary": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a \"literal\" byte count, which is automatically read by the client's receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.",
"evidence": "osv:UBUNTU-CVE-2025-43857",
"products": [
{
"name": {
"value": "jruby",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.5.6-5ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.6-6",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.6-7",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.6-9+deb8u2build0.14.04.1~esm2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1.7.21-2ubuntu4",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.22-1ubuntu1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "ruby2.5",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.5.0~preview1-1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.0-4ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.0-4ubuntu4",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.0-5ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.0-6ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.1",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.2",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.4",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.5",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.6",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.7",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.8",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.9",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.10",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.11",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.12",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.13",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.14",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.15",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16+esm1",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16+esm3",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16+esm4",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16+esm5",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16+esm6",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16+esm7",
"evidence": "/affected/2/versions"
},
{
"value": "2.5.1-1ubuntu1.16+esm8",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.1.13.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "9.1.17.0-1~18.04",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "ruby2.7",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.7.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-2",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-3",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-4",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-4ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.1",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.2",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.3",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.4",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.5",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.6",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.7",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.8",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.9",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.10",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.11",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.12",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.13",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.14",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.15",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.16",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.17",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.18",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.18+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.18+esm3",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.18+esm4",
"evidence": "/affected/4/versions"
},
{
"value": "2.7.0-5ubuntu1.18+esm5",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.1.17.0-3",
"evidence": "/affected/5/versions"
},
{
"value": "9.1.17.0-3build5",
"evidence": "/affected/5/versions"
},
{
"value": "9.1.17.0-3build6",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "ruby3.0",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.2-5ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.1",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.2",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.3",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.4",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.5",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.6",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.7",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.8",
"evidence": "/affected/6/versions"
},
{
"value": "3.0.2-7ubuntu2.10",
"evidence": "/affected/6/versions"
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{
"value": "3.0.2-7ubuntu2.11",
"evidence": "/affected/6/versions"
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{
"value": "3.0.2-7ubuntu2.12",
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},
{
"value": "3.0.2-7ubuntu2.13",
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}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.3.9.0+ds-1",
"evidence": "/affected/7/versions"
},
{
"value": "9.4.5.0+ds-1",
"evidence": "/affected/7/versions"
},
{
"value": "9.4.5.0+ds-1ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "9.4.6.0+ds-1ubuntu3",
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}
]
},
{
"name": {
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},
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{
"value": "3.2.3-1",
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{
"value": "3.2.3-1build2",
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},
{
"value": "3.2.3-1build3",
"evidence": "/affected/8/versions"
},
{
"value": "3.2.3-1ubuntu0.24.04.1",
"evidence": "/affected/8/versions"
},
{
"value": "3.2.3-1ubuntu0.24.04.3",
"evidence": "/affected/8/versions"
},
{
"value": "3.2.3-1ubuntu0.24.04.5",
"evidence": "/affected/8/versions"
},
{
"value": "3.2.3-1ubuntu0.24.04.6",
"evidence": "/affected/8/versions"
},
{
"value": "3.2.3-1ubuntu0.24.04.7",
"evidence": "/affected/8/versions"
},
{
"value": "3.2.3-1ubuntu0.24.04.8",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.4.8.0+ds-2ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "9.4.8.0+ds-3ubuntu1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "ruby3.3",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.3.7-1ubuntu2",
"evidence": "/affected/10/versions"
},
{
"value": "3.3.8-2ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "3.3.8-2ubuntu2",
"evidence": "/affected/10/versions"
},
{
"value": "3.3.8-2ubuntu2.1",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.4.8.0+ds-3ubuntu1",
"evidence": "/affected/11/versions"
},
{
"value": "9.4.14.0+ds-1",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "ruby3.3",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.3.8-2ubuntu3",
"evidence": "/affected/12/versions"
},
{
"value": "3.3.8-2.2ubuntu4",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.4.8.0+ds-3ubuntu1",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "ruby3.3",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.3.8-2ubuntu2",
"evidence": "/affected/14/versions"
},
{
"value": "3.3.8-2ubuntu3",
"evidence": "/affected/14/versions"
},
{
"value": "3.3.8-2ubuntu3.1",
"evidence": "/affected/14/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2025-43857",
"aliases": [
"UBUNTU-CVE-2025-43857"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "low"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jruby",
"purl": "pkg:deb/ubuntu/jruby?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"1.5.6-5ubuntu1",
"1.5.6-6",
"1.5.6-7",
"1.5.6-9+deb8u2build0.14.04.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-43857.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jruby",
"binary_version": "1.5.6-9+deb8u2build0.14.04.1~esm2"
}
],
"priority_reason": "Only a memory consumption issue when connecting to untrusted IMAP servers"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jruby",
"purl": "pkg:deb/ubuntu/jruby?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1.7.21-2ubuntu4",
"1.7.22-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-43857.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jruby",
"binary_version": "1.7.22-1ubuntu1"
}
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],
"modified": "2026-10-17T12:57:04.140663806Z",
"provider": "osv",
"upstream": [
"CVE-2025-43857"
],
"references": [
"https://ubuntu.com/security/CVE-2025-43857",
"https://www.cve.org/CVERecord?id=CVE-2025-43857",
"https://github.com/ruby/net-imap/security/advisories/GHSA-j3g3-5qv5-52mj"
]
},
"related_cves": [
{
"value": "CVE-2025-43857",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356690,
"published_at": "2025-04-28T16:15:00+00:00"
}