ubuntu-cve-2026-42766
Vulnerability from osv_ubuntu
Published
2026-06-09 00:00
Modified
2026-07-08 20:55
Summary
Details
Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption. Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service. The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present. An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service. Applications that process password-encrypted CMS messages may be 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
5.9 (Medium)
N/A (UNKNOWN)
References
{
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{
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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",
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},
{
"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",
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},
{
"binary_name": "qemu-efi-riscv64",
"binary_version": "2025.02-8ubuntu3.2"
}
],
"priority_reason": "OpenSSL developers have rated this as being low severity"
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "edk2",
"purl": "pkg:deb/ubuntu/edk2@2025.02-8ubuntu3.2?arch=source\u0026distro=questing"
},
"ranges": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2025.02-3ubuntu2",
"2025.02-8",
"2025.02-8ubuntu1",
"2025.02-8ubuntu2",
"2025.02-8ubuntu3",
"2025.02-8ubuntu3.1",
"2025.02-8ubuntu3.2"
]
},
{
"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 low severity"
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@3.5.3-1ubuntu3.4?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
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},
{
"fixed": "3.5.3-1ubuntu3.4"
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],
"type": "ECOSYSTEM"
}
],
"versions": [
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"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"
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{
"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"
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{
"binary_name": "ovmf-inteltdx",
"binary_version": "2025.11-3ubuntu7"
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{
"binary_name": "ovmf-legacy",
"binary_version": "2025.11-3ubuntu7"
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{
"binary_name": "qemu-efi-aarch64",
"binary_version": "2025.11-3ubuntu7"
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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 low severity"
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"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "edk2",
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"2025.11-3ubuntu7"
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},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libssl3t64",
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{
"binary_name": "openssl",
"binary_version": "3.5.5-1ubuntu3.2"
},
{
"binary_name": "openssl-provider-legacy",
"binary_version": "3.5.5-1ubuntu3.2"
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],
"priority_reason": "OpenSSL developers have rated this as being low severity"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@3.5.5-1ubuntu3.2?arch=source\u0026distro=resolute"
},
"ranges": [
{
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{
"introduced": "0"
},
{
"fixed": "3.5.5-1ubuntu3.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.5.3-1ubuntu2",
"3.5.5-1ubuntu1",
"3.5.5-1ubuntu3"
]
}
],
"aliases": [],
"details": "Issue summary: A specially crafted password-encrypted CMS message can trigger a NULL pointer dereference during CMS decryption. Impact summary: This NULL pointer dereference leads to an application crash and a Denial of Service. The CMS PasswordRecipientInfo.keyDerivationAlgorithm field is defined as OPTIONAL in the ASN.1 specification and may therefore be absent in specially crafted inputs. During the password-based CMS decryption the OpenSSL CMS implementation dereferences this field without first checking whether it was present. An attacker who supplies such a CMS message to an application performing password-based CMS decryption can trigger an application crash, leading to a Denial of Service. Applications that process password-encrypted CMS messages may be 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-2026-42766",
"modified": "2026-07-08T20:55:22Z",
"published": "2026-06-09T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42766"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42766"
},
{
"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:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-42766"
]
}
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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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