ubuntu-cve-2026-59640
Vulnerability from osv_ubuntu
Published
2026-08-04 00:00
Modified
2026-08-04 00:00
Summary
Details
In Bouncy Castle for Java before 1.85, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbcmail-java",
"binary_version": "1.51-4ubuntu1+esm1"
},
{
"binary_name": "libbcpg-java",
"binary_version": "1.51-4ubuntu1+esm1"
},
{
"binary_name": "libbcpkix-java",
"binary_version": "1.51-4ubuntu1+esm1"
},
{
"binary_name": "libbcprov-java",
"binary_version": "1.51-4ubuntu1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "bouncycastle",
"purl": "pkg:deb/ubuntu/bouncycastle@1.51-4ubuntu1+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.49+dfsg-3ubuntu1",
"1.51-4ubuntu1",
"1.51-4ubuntu1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbcmail-java",
"binary_version": "1.59-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcpg-java",
"binary_version": "1.59-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcpkix-java",
"binary_version": "1.59-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcprov-java",
"binary_version": "1.59-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "bouncycastle",
"purl": "pkg:deb/ubuntu/bouncycastle@1.59-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.57-1",
"1.58-1",
"1.59-1",
"1.59-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbcmail-java",
"binary_version": "1.61-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcpg-java",
"binary_version": "1.61-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcpkix-java",
"binary_version": "1.61-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcprov-java",
"binary_version": "1.61-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "bouncycastle",
"purl": "pkg:deb/ubuntu/bouncycastle@1.61-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.61-1",
"1.61-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbcmail-java",
"binary_version": "1.68-5ubuntu0.1~esm1"
},
{
"binary_name": "libbcpg-java",
"binary_version": "1.68-5ubuntu0.1~esm1"
},
{
"binary_name": "libbcpkix-java",
"binary_version": "1.68-5ubuntu0.1~esm1"
},
{
"binary_name": "libbcprov-java",
"binary_version": "1.68-5ubuntu0.1~esm1"
},
{
"binary_name": "libbctls-java",
"binary_version": "1.68-5ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "bouncycastle",
"purl": "pkg:deb/ubuntu/bouncycastle@1.68-5ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.68-2",
"1.68-4",
"1.68-5",
"1.68-5ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbcjmail-java",
"binary_version": "1.77-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcmail-java",
"binary_version": "1.77-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcpg-java",
"binary_version": "1.77-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcpkix-java",
"binary_version": "1.77-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcprov-java",
"binary_version": "1.77-1ubuntu0.1~esm1"
},
{
"binary_name": "libbctls-java",
"binary_version": "1.77-1ubuntu0.1~esm1"
},
{
"binary_name": "libbcutil-java",
"binary_version": "1.77-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "bouncycastle",
"purl": "pkg:deb/ubuntu/bouncycastle@1.77-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.72-2",
"1.77-1",
"1.77-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbcjmail-java",
"binary_version": "1.80-3"
},
{
"binary_name": "libbcmail-java",
"binary_version": "1.80-3"
},
{
"binary_name": "libbcpg-java",
"binary_version": "1.80-3"
},
{
"binary_name": "libbcpkix-java",
"binary_version": "1.80-3"
},
{
"binary_name": "libbcprov-java",
"binary_version": "1.80-3"
},
{
"binary_name": "libbctls-java",
"binary_version": "1.80-3"
},
{
"binary_name": "libbcutil-java",
"binary_version": "1.80-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "bouncycastle",
"purl": "pkg:deb/ubuntu/bouncycastle@1.80-3?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.80-3"
]
}
],
"aliases": [],
"details": "In Bouncy Castle for Java before 1.85, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).",
"id": "UBUNTU-CVE-2026-59640",
"modified": "2026-08-04T00:00:00Z",
"published": "2026-08-04T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-59640"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-59640"
},
{
"type": "REPORT",
"url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059640"
},
{
"type": "REPORT",
"url": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-59640"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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