ubuntu-cve-2026-63074
Vulnerability from osv_ubuntu
Published
2026-08-25 00:00
Modified
2026-09-02 16:20
Summary
Details
Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches additional certificates (extraCerts) sent in a CMP message, but never expunges them (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX frequently, this cache of extraCerts may grow unboundedly, and a malicious client may flood a CMP server with requests driving this growth. Impact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX for the lifetime of a server process may observe unbounded memory growth in the event a malicious client repeatedly sends requests containing unique extra certificates, which may lead to OOM conditions. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: If a remote user sends CMP messages to a server with a list of extraCerts and the message is rejected, the extraCerts from the message remains in the server contexts untrusted certificate stack. This exposes servers with long lived ctx objects to Denial of Service attacks in which an attacker sends messages intending to be rejected with a large list of additional certificates repeatedly, forcing the server to store them indefinitely. The issue was fixed by removing the added extra certs if the message is rejected, using the same method as when the context is configured to not do caching at all. FIPS impact: no As the CMP code lives outside the FIPS module boundary, no FIPS modules are affected by this CVE.
Severity
5.9 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
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{
"binary_name": "nodejs",
"binary_version": "4.2.6~dfsg-1ubuntu4.2+esm3"
},
{
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}
],
"priority_reason": "OpenSSL developers have rated this low severity"
},
"package": {
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},
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"4.2.4~dfsg-2",
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]
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"8.10.0~dfsg-2ubuntu0.4+esm4",
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]
},
{
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},
"package": {
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{
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"priority_reason": "OpenSSL developers have rated this low severity"
},
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{
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},
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"3.0.2-0ubuntu1.18+Fips1",
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]
},
{
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{
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}
],
"priority_reason": "OpenSSL developers have rated this low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:22.04:LTS",
"name": "openssl-fips",
"purl": "pkg:deb/ubuntu/openssl-fips@3.0.5-0ubuntu0.2+Fips1?arch=source\u0026distro=fips-updates/jammy"
},
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{
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efi-shell-aa64",
"binary_version": "2024.02-2ubuntu0.9"
},
{
"binary_name": "efi-shell-arm",
"binary_version": "2024.02-2ubuntu0.9"
},
{
"binary_name": "efi-shell-ia32",
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},
{
"binary_name": "efi-shell-riscv64",
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{
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{
"binary_name": "ovmf",
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"binary_name": "ovmf-ia32",
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{
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"binary_name": "qemu-efi-arm",
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},
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"2024.02-2ubuntu0.7",
"2024.02-2ubuntu0.8",
"2024.02-2ubuntu0.9"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libssl3t64",
"binary_version": "3.0.13-0ubuntu3.15"
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{
"binary_name": "openssl",
"binary_version": "3.0.13-0ubuntu3.15"
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},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "openssl",
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},
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"versions": [
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"3.0.13-0ubuntu3",
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"3.0.13-0ubuntu3.11",
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]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "openssl-fips-module-3",
"binary_version": "3.0.13-0ubuntu3.15+Fips1"
}
],
"priority_reason": "OpenSSL developers have rated this low severity"
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:24.04:LTS",
"name": "openssl-fips",
"purl": "pkg:deb/ubuntu/openssl-fips@3.0.13-0ubuntu3.15+Fips1?arch=source\u0026distro=fips-updates/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.13-0ubuntu3.15+Fips1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.13-0ubuntu3+Fips1",
"3.0.13-0ubuntu3.6+Fips1",
"3.0.13-0ubuntu3.12+Fips1"
]
},
{
"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"
},
{
"binary_name": "qemu-efi-aarch64",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "qemu-efi-loongarch64",
"binary_version": "2025.11-3ubuntu7"
},
{
"binary_name": "qemu-efi-riscv64",
"binary_version": "2025.11-3ubuntu7"
}
],
"priority_reason": "OpenSSL developers have rated this low severity"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "edk2",
"purl": "pkg:deb/ubuntu/edk2@2025.11-3ubuntu7?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2025.02-8ubuntu3",
"2025.11-3ubuntu6",
"2025.11-3ubuntu7"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efi-shell-aa64-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "efi-shell-loongarch64-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "efi-shell-riscv64-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "efi-shell-x64-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "ovmf-amdsev-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "ovmf-generic-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "ovmf-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "ovmf-inteltdx-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "ovmf-legacy-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "qemu-efi-aarch64-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "qemu-efi-loongarch64-hwe",
"binary_version": "2025.11-3ubuntu8"
},
{
"binary_name": "qemu-efi-riscv64-hwe",
"binary_version": "2025.11-3ubuntu8"
}
],
"priority_reason": "OpenSSL developers have rated this low severity"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "edk2-hwe",
"purl": "pkg:deb/ubuntu/edk2-hwe@2025.11-3ubuntu8?arch=source\u0026distro=resolute"
},
"ranges": [
{
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],
"type": "ECOSYSTEM"
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"versions": [
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"2025.11-3ubuntu8"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libssl3t64",
"binary_version": "3.5.5-1ubuntu3.4"
},
{
"binary_name": "openssl",
"binary_version": "3.5.5-1ubuntu3.4"
},
{
"binary_name": "openssl-provider-legacy",
"binary_version": "3.5.5-1ubuntu3.4"
}
],
"priority_reason": "OpenSSL developers have rated this low severity"
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@3.5.5-1ubuntu3.4?arch=source\u0026distro=resolute"
},
"ranges": [
{
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}
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"type": "ECOSYSTEM"
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],
"versions": [
"3.5.3-1ubuntu2",
"3.5.5-1ubuntu1",
"3.5.5-1ubuntu3",
"3.5.5-1ubuntu3.2",
"3.5.5-1ubuntu3.3"
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}
],
"aliases": [],
"details": "Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches additional certificates (extraCerts) sent in a CMP message, but never expunges them (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX frequently, this cache of extraCerts may grow unboundedly, and a malicious client may flood a CMP server with requests driving this growth. Impact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX for the lifetime of a server process may observe unbounded memory growth in the event a malicious client repeatedly sends requests containing unique extra certificates, which may lead to OOM conditions. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: If a remote user sends CMP messages to a server with a list of extraCerts and the message is rejected, the extraCerts from the message remains in the server contexts untrusted certificate stack. This exposes servers with long lived ctx objects to Denial of Service attacks in which an attacker sends messages intending to be rejected with a large list of additional certificates repeatedly, forcing the server to store them indefinitely. The issue was fixed by removing the added extra certs if the message is rejected, using the same method as when the context is configured to not do caching at all. FIPS impact: no As the CMP code lives outside the FIPS module boundary, no FIPS modules are affected by this CVE.",
"id": "UBUNTU-CVE-2026-63074",
"modified": "2026-09-02T16:20:05Z",
"published": "2026-08-25T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-63074"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-63074"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8678-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8678-2"
}
],
"related": [
"USN-8678-1",
"USN-8678-2"
],
"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-2026-63074"
]
}
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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