HighFix available
edk2, edk2-hwe and 2 more products — security advisory
Issue Summary: The PKCS#12 file processing fails to perform sufficient input validation for files that use Password-Based Message Authentication Code 1 (PBMAC1) integrity mechanism allowing a certificate and private key forgery. Impact Summary: An attacker impersonating a user can cause a service reading PKCS#12 files to accept forged certificates and private keys with a 1 in 256 probability. If a service accepting PKCS#12 files is using passwords for authenticating the received files, the attacker can create unencrypted PKCS#12 files that use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing them to craft a file that will be accepted with a 1 in 256 probability. That would then cause the service to accept a certificate and private key controlled by the attacker. The FIPS modules are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
- Products
- edk2, edk2-hwe, nodejs, openssl
- Affected versions
- 12.22.5~dfsg-5ubuntu1, 12.22.7~dfsg-2ubuntu1, 12.22.7~dfsg-2ubuntu3, 12.22.9~dfsg-1ubuntu2, 12.22.9~dfsg-1ubuntu3, 12.22.9~dfsg-1ubuntu3.1, 12.22.9~dfsg-1ubuntu3.2, 12.22.9~dfsg-1ubuntu3.3, 12.22.9~dfsg-1ubuntu3.4, 12.22.9~dfsg-1ubuntu3.5, 12.22.9~dfsg-1ubuntu3.6, 12.22.9~dfsg-1ubuntu3.6+esm2, 2025.02-3ubuntu2, 2025.02-8, 2025.02-8ubuntu1, 2025.02-8ubuntu2, 2025.02-8ubuntu3, 2025.02-8ubuntu3.1, 2025.02-8ubuntu3.2, 2025.11-3ubuntu6, 2025.11-3ubuntu7, 2025.11-3ubuntu7.2, 2025.11-3ubuntu7.3, 2025.11-3ubuntu8, 2025.11-3ubuntu8.2, 2025.11-3ubuntu9, 2026.05-2ubuntu1, 2026.05-2ubuntu2, 2026.05-2ubuntu3, 3.4.1-1ubuntu3, 3.5.0-2ubuntu1, 3.5.2-1ubuntu1, 3.5.3-1ubuntu2, 3.5.3-1ubuntu3, 3.5.3-1ubuntu3.3, 3.5.5-1ubuntu1, 3.5.5-1ubuntu3
- Fixed versions
- 3.5.3-1ubuntu3.4, 3.5.5-1ubuntu3.2
- CVEs
- CVE-2026-34181
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:00 UTC · Revision 1
Source evidence
Issue Summary: The PKCS#12 file processing fails to perform sufficient input validation for files that use Password-Based Message Authentication Code 1 (PBMAC1) integrity mechanism allowing a certificate and private key forgery. Impact Summary: An attacker impersonating a user can cause a service reading PKCS#12 files to accept forged certificates and private keys with a 1 in 256 probability. If a service accepting PKCS#12 files is using passwords for authenticating the received files, the attacker can create unencrypted PKCS#12 files that use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing them to craft a file that will be accepted with a 1 in 256 probability. That would then cause the service to accept a certificate and private key controlled by the attacker. The FIPS modules are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
osv:UBUNTU-CVE-2026-34181
nodejs
Fixed versions: Not specified
edk2
Fixed versions: Not specified
openssl
Fixed versions: 3.5.3-1ubuntu3.4
edk2
Fixed versions: Not specified
edk2-hwe
Fixed versions: Not specified
edk2
Fixed versions: Not specified
edk2-hwe
Fixed versions: Not specified
openssl
Fixed versions: 3.5.5-1ubuntu3.2
Complete source record
{
"id": "e8ac4ddfe4d5549e9b8e7154ceb08bc2dc4a4c31dbd14cdbf31865e72e5d8728",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-34181",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-34181",
"summary": "Issue Summary: The PKCS#12 file processing fails to perform sufficient input validation for files that use Password-Based Message Authentication Code 1 (PBMAC1) integrity mechanism allowing a certificate and private key forgery. Impact Summary: An attacker impersonating a user can cause a service reading PKCS#12 files to accept forged certificates and private keys with a 1 in 256 probability. If a service accepting PKCS#12 files is using passwords for authenticating the received files, the attacker can create unencrypted PKCS#12 files that use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing them to craft a file that will be accepted with a 1 in 256 probability. That would then cause the service to accept a certificate and private key controlled by the attacker. The FIPS modules are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.",
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{
"value": "2026.05-2ubuntu1",
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{
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{
"value": "2025.11-3ubuntu9",
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{
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{
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{
"value": "2025.11-3ubuntu6",
"evidence": "/affected/5/versions"
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{
"value": "2025.11-3ubuntu7",
"evidence": "/affected/5/versions"
},
{
"value": "2025.11-3ubuntu7.2",
"evidence": "/affected/5/versions"
},
{
"value": "2025.11-3ubuntu7.3",
"evidence": "/affected/5/versions"
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]
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{
"name": {
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"value": "2025.11-3ubuntu8",
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],
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"aliases": [
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"metrics": [
{
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},
{
"binary_name": "efi-shell-loongarch64",
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},
{
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],
"package": {
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2025.11-3ubuntu6",
"2025.11-3ubuntu8",
"2025.11-3ubuntu8.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34181.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efi-shell-aa64-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "efi-shell-loongarch64-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "efi-shell-riscv64-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "efi-shell-x64-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "ovmf-amdsev-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "ovmf-generic-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "ovmf-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "ovmf-inteltdx-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "ovmf-legacy-hwe",
"binary_version": "2025.11-3ubuntu8.2"
},
{
"binary_name": "qemu-efi-aarch64-hwe",
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},
{
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},
{
"binary_name": "qemu-efi-riscv64-hwe",
"binary_version": "2025.11-3ubuntu8.2"
}
],
"priority_reason": "OpenSSL developers have rated this as being low severity"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.5-1ubuntu3.2"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"3.5.5-1ubuntu1",
"3.5.5-1ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34181.json"
},
"ecosystem_specific": {
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{
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"binary_version": "3.5.5-1ubuntu3.2"
},
{
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},
{
"binary_name": "openssl-provider-legacy",
"binary_version": "3.5.5-1ubuntu3.2"
}
],
"availability": "No subscription required",
"priority_reason": "OpenSSL developers have rated this as being low severity"
}
}
],
"modified": "2026-10-17T13:00:01.412188309Z",
"provider": "osv",
"upstream": [
"CVE-2026-34181"
],
"references": [
"https://ubuntu.com/security/CVE-2026-34181",
"https://www.cve.org/CVERecord?id=CVE-2026-34181",
"https://openssl-library.org/news/secadv/20260609.txt",
"https://ubuntu.com/security/notices/USN-8414-1"
]
},
"related_cves": [
{
"value": "CVE-2026-34181",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360139,
"published_at": "2026-06-09T00:00:00+00:00"
}