LowFix available
edk2, edk2-hwe and 3 more products — security advisory
Issue summary: When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42) peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r (a small prime factor of the cofactor (p−1)/q_local), and a public value Y of order r can recover the victim's private key after a small number of key exchange attempts. When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42) peer key, the subgroup membership check Y^q ≡ 1 (mod p) is performed using the peer's own q parameter, not the local key's q. The peer's domain parameters are then matched against the domain parameters of the private key, but the value of q is not compared. A malicious peer who presents an X9.42 key carrying the victim's p, g, a forged q = r (a small prime factor of the cofactor), and a public value Y of order r passes all checks. The shared secret then takes only r distinct values, leaking priv mod r. Repeating for each small-prime factor of the cofactor and combining via CRT recovers the full private key (Lim–Lee / small-subgroup-confinement attack). The realistic attack surface is narrow: principally CMP deployments with long-lived RA/CA DHX keys and bespoke enterprise or government applications using X9.42 DHX static keys with interactive protocols and therefore this issue was assigned Low severity. The FIPS modules in 4.0, 3.6, 3.5, 3.4, 3.1.2 and 3.0 are affected by this issue.
- Products
- edk2, edk2-hwe, nodejs, openssl, openssl-fips
- Affected versions
- 1.1.1l-1ubuntu1, 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, 2023.05-2, 2023.11-2, 2023.11-3, 2023.11-4, 2023.11-5, 2023.11-6, 2023.11-8, 2024.02-1, 2024.02-2, 2024.02-2ubuntu0.1, 2024.02-2ubuntu0.10, 2024.02-2ubuntu0.3, 2024.02-2ubuntu0.4, 2024.02-2ubuntu0.5, 2024.02-2ubuntu0.6, 2024.02-2ubuntu0.7, 2024.02-2ubuntu0.8, 2024.02-2ubuntu0.9, 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, 3.0.0-1ubuntu1, 3.0.1-0ubuntu1, 3.0.10-1ubuntu2, 3.0.10-1ubuntu2.1, 3.0.10-1ubuntu3, 3.0.10-1ubuntu4, 3.0.13-0ubuntu2, 3.0.13-0ubuntu3, 3.0.13-0ubuntu3+Fips1, 3.0.13-0ubuntu3.1, 3.0.13-0ubuntu3.2, 3.0.13-0ubuntu3.3, 3.0.13-0ubuntu3.4, 3.0.13-0ubuntu3.5, 3.0.13-0ubuntu3.6, 3.0.13-0ubuntu3.6+Fips1, 3.0.13-0ubuntu3.7, 3.0.13-0ubuntu3.9, 3.0.2-0ubuntu1, 3.0.2-0ubuntu1.1, 3.0.2-0ubuntu1.10, 3.0.2-0ubuntu1.10+Fips1, 3.0.2-0ubuntu1.12, 3.0.2-0ubuntu1.12+Fips1, 3.0.2-0ubuntu1.13, 3.0.2-0ubuntu1.14, 3.0.2-0ubuntu1.14+Fips1, 3.0.2-0ubuntu1.15, 3.0.2-0ubuntu1.15+Fips1, 3.0.2-0ubuntu1.16, 3.0.2-0ubuntu1.16+Fips1, 3.0.2-0ubuntu1.17, 3.0.2-0ubuntu1.17+Fips1, 3.0.2-0ubuntu1.18, 3.0.2-0ubuntu1.18+Fips1, 3.0.2-0ubuntu1.19, 3.0.2-0ubuntu1.19+Fips1, 3.0.2-0ubuntu1.2, 3.0.2-0ubuntu1.20, 3.0.2-0ubuntu1.20+Fips1, 3.0.2-0ubuntu1.21, 3.0.2-0ubuntu1.21+Fips1, 3.0.2-0ubuntu1.23, 3.0.2-0ubuntu1.23+Fips1, 3.0.2-0ubuntu1.4, 3.0.2-0ubuntu1.5, 3.0.2-0ubuntu1.6, 3.0.2-0ubuntu1.7, 3.0.2-0ubuntu1.8, 3.0.2-0ubuntu1.9, 3.0.5-0ubuntu0.1+Fips2.1, 3.0.5-0ubuntu0.2+Fips1, 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
- 3.0.13-0ubuntu3.11, 3.0.13-0ubuntu3.12+Fips1, 3.0.2-0ubuntu1.25, 3.0.2-0ubuntu1.25+Fips1, 3.5.3-1ubuntu3.4, 3.5.5-1ubuntu3.2
- CVEs
- CVE-2026-42770
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:12 UTC · Revision 1
Source evidence
Issue summary: When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42) peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r (a small prime factor of the cofactor (p−1)/q_local), and a public value Y of order r can recover the victim's private key after a small number of key exchange attempts. When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42) peer key, the subgroup membership check Y^q ≡ 1 (mod p) is performed using the peer's own q parameter, not the local key's q. The peer's domain parameters are then matched against the domain parameters of the private key, but the value of q is not compared. A malicious peer who presents an X9.42 key carrying the victim's p, g, a forged q = r (a small prime factor of the cofactor), and a public value Y of order r passes all checks. The shared secret then takes only r distinct values, leaking priv mod r. Repeating for each small-prime factor of the cofactor and combining via CRT recovers the full private key (Lim–Lee / small-subgroup-confinement attack). The realistic attack surface is narrow: principally CMP deployments with long-lived RA/CA DHX keys and bespoke enterprise or government applications using X9.42 DHX static keys with interactive protocols and therefore this issue was assigned Low severity. The FIPS modules in 4.0, 3.6, 3.5, 3.4, 3.1.2 and 3.0 are affected by this issue.
osv:UBUNTU-CVE-2026-42770
openssl
Fixed versions: 3.0.2-0ubuntu1.25
nodejs
Fixed versions: Not specified
openssl
Fixed versions: Not specified
openssl-fips
Fixed versions: Not specified
openssl
Fixed versions: 3.0.2-0ubuntu1.25+Fips1
openssl-fips
Fixed versions: Not specified
edk2
Fixed versions: Not specified
openssl
Fixed versions: 3.0.13-0ubuntu3.11
openssl-fips
Fixed versions: 3.0.13-0ubuntu3.12+Fips1
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": "792cb932450296df4f1da5b1d3439951883ec2b77d4de898b4e2b8bc56f700aa",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-42770",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-42770",
"summary": "Issue summary: When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42) peer key, the peer key is not properly checked for the subgroup membership. Impact summary: A malicious peer which presents an X9.42 key carrying the victim's p and g parameters, a forged q = r (a small prime factor of the cofactor (p−1)/q_local), and a public value Y of order r can recover the victim's private key after a small number of key exchange attempts. When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42) peer key, the subgroup membership check Y^q ≡ 1 (mod p) is performed using the peer's own q parameter, not the local key's q. The peer's domain parameters are then matched against the domain parameters of the private key, but the value of q is not compared. A malicious peer who presents an X9.42 key carrying the victim's p, g, a forged q = r (a small prime factor of the cofactor), and a public value Y of order r passes all checks. The shared secret then takes only r distinct values, leaking priv mod r. Repeating for each small-prime factor of the cofactor and combining via CRT recovers the full private key (Lim–Lee / small-subgroup-confinement attack). The realistic attack surface is narrow: principally CMP deployments with long-lived RA/CA DHX keys and bespoke enterprise or government applications using X9.42 DHX static keys with interactive protocols and therefore this issue was assigned Low severity. The FIPS modules in 4.0, 3.6, 3.5, 3.4, 3.1.2 and 3.0 are affected by this issue.",
"evidence": "osv:UBUNTU-CVE-2026-42770",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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{
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{
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"evidence": "/affected/0/versions"
},
{
"value": "3.0.0-1ubuntu1",
"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/0/versions"
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{
"value": "3.0.2-0ubuntu1.10",
"evidence": "/affected/0/versions"
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{
"value": "3.0.2-0ubuntu1.12",
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{
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/0/versions"
},
{
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}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "12.22.5~dfsg-5ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.7~dfsg-2ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.7~dfsg-2ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3.1",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3.2",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3.3",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3.4",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3.5",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3.6",
"evidence": "/affected/1/versions"
},
{
"value": "12.22.9~dfsg-1ubuntu3.6+esm2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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{
"value": "3.0.2-0ubuntu1.10+Fips1",
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},
{
"value": "3.0.2-0ubuntu1.12+Fips1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "openssl-fips",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.5-0ubuntu0.1+Fips2.1",
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}
]
},
{
"name": {
"value": "openssl",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.0.2-0ubuntu1.25+Fips1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "3.0.2-0ubuntu1.10+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.12+Fips1",
"evidence": "/affected/4/versions"
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{
"value": "3.0.2-0ubuntu1.14+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.15+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.16+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.17+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.18+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.19+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.20+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.21+Fips1",
"evidence": "/affected/4/versions"
},
{
"value": "3.0.2-0ubuntu1.23+Fips1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "openssl-fips",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.0.5-0ubuntu0.1+Fips2.1",
"evidence": "/affected/5/versions"
},
{
"value": "3.0.5-0ubuntu0.2+Fips1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "edk2",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2023.05-2",
"evidence": "/affected/6/versions"
},
{
"value": "2023.11-2",
"evidence": "/affected/6/versions"
},
{
"value": "2023.11-3",
"evidence": "/affected/6/versions"
},
{
"value": "2023.11-4",
"evidence": "/affected/6/versions"
},
{
"value": "2023.11-5",
"evidence": "/affected/6/versions"
},
{
"value": "2023.11-6",
"evidence": "/affected/6/versions"
},
{
"value": "2023.11-8",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-1",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2ubuntu0.1",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2ubuntu0.3",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2ubuntu0.4",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2ubuntu0.5",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2ubuntu0.6",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2ubuntu0.7",
"evidence": "/affected/6/versions"
},
{
"value": "2024.02-2ubuntu0.8",
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},
{
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{
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]
},
{
"name": {
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"evidence": "/affected/7/package/name"
},
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{
"value": "3.0.13-0ubuntu3.11",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": [
{
"value": "3.0.10-1ubuntu2",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.10-1ubuntu2.1",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.10-1ubuntu3",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.10-1ubuntu4",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu2",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu3",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu3.1",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu3.2",
"evidence": "/affected/7/versions"
},
{
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"evidence": "/affected/7/versions"
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{
"value": "3.0.13-0ubuntu3.4",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu3.5",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu3.6",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu3.7",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.13-0ubuntu3.9",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "openssl-fips",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.0.13-0ubuntu3.12+Fips1",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": [
{
"value": "3.0.13-0ubuntu3+Fips1",
"evidence": "/affected/8/versions"
},
{
"value": "3.0.13-0ubuntu3.6+Fips1",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "edk2",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2025.02-3ubuntu2",
"evidence": "/affected/9/versions"
},
{
"value": "2025.02-8",
"evidence": "/affected/9/versions"
},
{
"value": "2025.02-8ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "2025.02-8ubuntu2",
"evidence": "/affected/9/versions"
},
{
"value": "2025.02-8ubuntu3",
"evidence": "/affected/9/versions"
},
{
"value": "2025.02-8ubuntu3.1",
"evidence": "/affected/9/versions"
},
{
"value": "2025.02-8ubuntu3.2",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "openssl",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.5.3-1ubuntu3.4",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": [
{
"value": "3.4.1-1ubuntu3",
"evidence": "/affected/10/versions"
},
{
"value": "3.5.0-2ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "3.5.2-1ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "3.5.3-1ubuntu2",
"evidence": "/affected/10/versions"
},
{
"value": "3.5.3-1ubuntu3",
"evidence": "/affected/10/versions"
},
{
"value": "3.5.3-1ubuntu3.3",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "edk2",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2025.11-3ubuntu7",
"evidence": "/affected/11/versions"
},
{
"value": "2025.11-3ubuntu8",
"evidence": "/affected/11/versions"
},
{
"value": "2026.05-2ubuntu1",
"evidence": "/affected/11/versions"
},
{
"value": "2026.05-2ubuntu2",
"evidence": "/affected/11/versions"
},
{
"value": "2026.05-2ubuntu3",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "edk2-hwe",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2025.11-3ubuntu8",
"evidence": "/affected/12/versions"
},
{
"value": "2025.11-3ubuntu9",
"evidence": "/affected/12/versions"
},
{
"value": "2026.05-2ubuntu1",
"evidence": "/affected/12/versions"
},
{
"value": "2026.05-2ubuntu2",
"evidence": "/affected/12/versions"
},
{
"value": "2026.05-2ubuntu3",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "edk2",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2025.02-8ubuntu3",
"evidence": "/affected/13/versions"
},
{
"value": "2025.11-3ubuntu6",
"evidence": "/affected/13/versions"
},
{
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"modified": "2026-10-17T12:58:16.808423167Z",
"provider": "osv",
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],
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"https://openssl-library.org/news/secadv/20260609.txt",
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]
},
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"evidence": "/upstream"
}
],
"security_relevant": true,
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},
"source_id": "core-osv",
"document_id": 358505,
"published_at": "2026-06-09T00:00:00+00:00"
}