ubuntu-cve-2026-45447
Vulnerability from osv_ubuntu
Published
2026-06-09 00:00
Modified
2026-07-08 20:56
Summary
Details
Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification. Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution. When processing a PKCS#7 or S/MIME signed message, if the SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-after-free condition. In the common case this occurs when the application later calls BIO_free() on the BIO originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage patterns, this may result in a crash or other memory corruption. In some application contexts this may potentially be exploitable for remote code execution. Applications that process PKCS#7 or S/MIME signed messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this processing are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
Severity
8.8 (High)
8.1 (High)
N/A (UNKNOWN)
References
{
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{
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"3.0.13-0ubuntu3+Fips1",
"3.0.13-0ubuntu3.6+Fips1"
]
},
{
"ecosystem_specific": {
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"binary_version": "2025.02-8ubuntu3.2"
},
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},
{
"binary_name": "efi-shell-riscv64",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "efi-shell-x64",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "ovmf",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "ovmf-ia32",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "ovmf-inteltdx",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "ovmf-legacy",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "qemu-efi-aarch64",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "qemu-efi-arm",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "qemu-efi-loongarch64",
"binary_version": "2025.02-8ubuntu3.2"
},
{
"binary_name": "qemu-efi-riscv64",
"binary_version": "2025.02-8ubuntu3.2"
}
],
"priority_reason": "OpenSSL developers have rated this as being high severity"
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "edk2",
"purl": "pkg:deb/ubuntu/edk2@2025.02-8ubuntu3.2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"2025.02-8",
"2025.02-8ubuntu1",
"2025.02-8ubuntu2",
"2025.02-8ubuntu3",
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"2025.02-8ubuntu3.2"
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},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libssl3t64",
"binary_version": "3.5.3-1ubuntu3.4"
},
{
"binary_name": "openssl",
"binary_version": "3.5.3-1ubuntu3.4"
},
{
"binary_name": "openssl-provider-legacy",
"binary_version": "3.5.3-1ubuntu3.4"
}
],
"priority_reason": "OpenSSL developers have rated this as being high severity"
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@3.5.3-1ubuntu3.4?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.3-1ubuntu3.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.4.1-1ubuntu3",
"3.5.0-2ubuntu1",
"3.5.2-1ubuntu1",
"3.5.3-1ubuntu2",
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efi-shell-aa64",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "efi-shell-loongarch64",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "efi-shell-riscv64",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "efi-shell-x64",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "ovmf",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "ovmf-amdsev",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "ovmf-generic",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "ovmf-inteltdx",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "ovmf-legacy",
"binary_version": "2025.11-3ubuntu7"
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{
"binary_name": "qemu-efi-aarch64",
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{
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{
"binary_name": "qemu-efi-riscv64",
"binary_version": "2025.11-3ubuntu7"
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],
"priority_reason": "OpenSSL developers have rated this as being high severity"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "edk2",
"purl": "pkg:deb/ubuntu/edk2@2025.11-3ubuntu7?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
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],
"type": "ECOSYSTEM"
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],
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},
{
"ecosystem_specific": {
"availability": "No subscription required",
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"binary_name": "libssl3t64",
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"binary_version": "3.5.5-1ubuntu3.2"
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],
"priority_reason": "OpenSSL developers have rated this as being high severity"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@3.5.5-1ubuntu3.2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
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}
],
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}
],
"versions": [
"3.5.3-1ubuntu2",
"3.5.5-1ubuntu1",
"3.5.5-1ubuntu3"
]
}
],
"aliases": [],
"details": "Issue summary: A specially crafted PKCS#7 or S/MIME signed message could trigger a use-after-free during PKCS#7 signature verification. Impact summary: A use-after-free may result in process crashes, heap corruption, or potentially remote code execution. When processing a PKCS#7 or S/MIME signed message, if the SignedData digestAlgorithms field is present as an empty ASN.1 SET, OpenSSL may incorrectly free a caller-owned BIO during PKCS7_verify(). A subsequent use of the BIO by the calling application results in a use-after-free condition. In the common case this occurs when the application later calls BIO_free() on the BIO originally passed to PKCS7_verify(). Depending on allocator behavior and application-specific BIO usage patterns, this may result in a crash or other memory corruption. In some application contexts this may potentially be exploitable for remote code execution. Applications that process PKCS#7 or S/MIME signed messages using OpenSSL PKCS#7 APIs may be affected. Applications using the CMS APIs for this processing are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.",
"id": "UBUNTU-CVE-2026-45447",
"modified": "2026-07-08T20:56:24Z",
"published": "2026-06-09T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-45447"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-45447"
},
{
"type": "REPORT",
"url": "https://openssl-library.org/news/secadv/20260609.txt"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8414-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8414-1"
}
],
"related": [
"USN-8414-2",
"USN-8414-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-45447"
]
}
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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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