ubuntu-cve-2026-71225
Vulnerability from osv_ubuntu
Published
2026-08-06 00:00
Modified
2026-08-06 00:00
Summary
Details
A flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library improperly reuses the Initialization Vector (IV) for each internal data chunk. A remote attacker could potentially exploit this by making an application that uses libkcapi process specially crafted large inputs. This can lead to a significant weakening of data confidentiality, as the repeated IV use can expose relationships in encrypted plaintext, and may also affect data integrity by causing incorrect cryptographic processing.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libkcapi-bin",
"binary_version": "0.13.0-0ubuntu1~ppa2"
},
{
"binary_name": "libkcapi0",
"binary_version": "0.13.0-0ubuntu1~ppa2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:16.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@0.13.0-0ubuntu1~ppa2?arch=source\u0026distro=fips-updates/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.13.0-0ubuntu1~ppa1",
"0.13.0-0ubuntu1~ppa2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libkcapi-bin",
"binary_version": "0.13.0-0ubuntu1~ppa2"
},
{
"binary_name": "libkcapi0",
"binary_version": "0.13.0-0ubuntu1~ppa2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:16.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@0.13.0-0ubuntu1~ppa2?arch=source\u0026distro=fips/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.13.0-0ubuntu1~ppa1",
"0.13.0-0ubuntu1~ppa2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.0.3-2"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.0.3-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.0.3-2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.0-2",
"1.0.1-1",
"1.0.2-1",
"1.0.3-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.0.3-2fips3"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.0.3-2fips3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:18.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.0.3-2fips3?arch=source\u0026distro=fips-updates/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.3-2fips3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.0.3-2fips3"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.0.3-2fips3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:18.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.0.3-2fips3?arch=source\u0026distro=fips/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.3-2fips3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.1.5-1"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.1.5-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.1.5-1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.3-1",
"1.1.5-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.1.5-1fips1"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.1.5-1fips1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:20.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.1.5-1fips1?arch=source\u0026distro=fips-updates/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.5-1fips1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.1.5-1fips1"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.1.5-1fips1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:20.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.1.5-1fips1?arch=source\u0026distro=fips/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.5-1fips1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.4.0-1"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.4.0-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.4.0-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.1-1",
"1.3.1-1",
"1.3.1-2",
"1.3.1-3",
"1.4.0-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.4.0-1ubuntu0.1~Fips1"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.4.0-1ubuntu0.1~Fips1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-preview:22.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.4.0-1ubuntu0.1~Fips1?arch=source\u0026distro=fips-preview/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.0-1ubuntu0.1~Fips1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.4.0-1ubuntu0.1~Fips1"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.4.0-1ubuntu0.1~Fips1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:22.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.4.0-1ubuntu0.1~Fips1?arch=source\u0026distro=fips-updates/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.0-1ubuntu0.1~Fips1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.4.0-1ubuntu4"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.4.0-1ubuntu4"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.4.0-1ubuntu4?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.0-1ubuntu3",
"1.4.0-1ubuntu4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "kcapi-tools",
"binary_version": "1.4.0-1ubuntu5"
},
{
"binary_name": "libkcapi1",
"binary_version": "1.4.0-1ubuntu5"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libkcapi",
"purl": "pkg:deb/ubuntu/libkcapi@1.4.0-1ubuntu5?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.0-1ubuntu4",
"1.4.0-1ubuntu5"
]
}
],
"aliases": [],
"details": "A flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library improperly reuses the Initialization Vector (IV) for each internal data chunk. A remote attacker could potentially exploit this by making an application that uses libkcapi process specially crafted large inputs. This can lead to a significant weakening of data confidentiality, as the repeated IV use can expose relationships in encrypted plaintext, and may also affect data integrity by causing incorrect cryptographic processing.",
"id": "UBUNTU-CVE-2026-71225",
"modified": "2026-08-06T00:00:00Z",
"published": "2026-08-06T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-71225"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-71225"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462011"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-71225"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-71225"
]
}
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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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