openssl — security advisory
Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr ' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a
- Products
- openssl
- Affected versions
- 3.0.10-1, 3.0.10-1~deb12u1, 3.0.11-1, 3.0.11-1~deb12u1, 3.0.11-1~deb12u2, 3.0.12-1, 3.0.12-2, 3.0.13-1~deb12u1, 3.0.13-1~deb12u2, 3.0.14-1~deb12u1, 3.0.14-1~deb12u2, 3.0.15-1~deb12u1, 3.0.16-1~deb12u1, 3.0.17-1~deb12u1, 3.0.17-1~deb12u2, 3.0.17-1~deb12u3, 3.0.18-1~deb12u1, 3.0.18-1~deb12u2, 3.0.19-1~deb12u1, 3.0.19-1~deb12u2, 3.0.20-1~deb12u1, 3.0.20-1~deb12u2, 3.0.22-1~deb12u1, 3.0.9-1, 3.5.1-1, 3.5.1-1+deb13u1, 3.5.2-1, 3.5.3-1, 3.5.4-1, 3.5.4-1~deb13u1, 3.5.4-1~deb13u2, 3.5.5-1, 3.5.5-1~deb13u1, 3.5.5-1~deb13u2, 3.5.6-1~deb13u1, 3.5.6-1~deb13u2, 3.5.7-1~deb13u1, 3.5.7-1~deb13u2, 3.5.7-1~deb13u3, 3.6.0-1, 3.6.0-2, 3.6.0~~alpha1-1, 3.6.0~~beta1-1, 3.6.1-1, 3.6.1-2, 3.6.1-3, 3.6.2-1, 3.6.3-1, 3.6.4-1
- Fixed versions
- 3.0.22-1~deb12u2, 3.5.7-1~deb13u3, 3.6.5-1
- CVEs
- CVE-2026-75805
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 10:34 UTC · Revision 1
Source evidence
Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr ' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a
osv:DEBIAN-CVE-2026-75805
openssl
Fixed versions: 3.0.22-1~deb12u2
openssl
Fixed versions: 3.5.7-1~deb13u3
openssl
Fixed versions: 3.6.5-1
Complete source record
{
"id": "85851679ea30e2797c90c8e9259a0d52f788d635fd281921dfbc64500987cb71",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-75805",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-75805",
"summary": "Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr ' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a ",
"evidence": "osv:DEBIAN-CVE-2026-75805",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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{
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"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/1/package/name"
},
"prerequisites": [],
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"evidence": "/affected/1/ranges"
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],
"affected_versions": [
{
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"evidence": "/affected/1/versions"
},
{
"value": "3.5.1-1+deb13u1",
"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
"value": "3.5.4-1~deb13u2",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
"value": "3.5.7-1~deb13u2",
"evidence": "/affected/2/versions"
},
{
"value": "3.5.7-1~deb13u3",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0~~alpha1-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.0~~beta1-1",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
"value": "3.6.1-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.1-3",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
"value": "3.6.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.6.4-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-75805",
"aliases": [
"DEBIAN-CVE-2026-75805"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.0.22-1~deb12u2"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"3.0.10-1~deb12u1",
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"3.0.12-1",
"3.0.12-2",
"3.0.13-1~deb12u1",
"3.0.13-1~deb12u2",
"3.0.14-1~deb12u1",
"3.0.14-1~deb12u2",
"3.0.15-1~deb12u1",
"3.0.16-1~deb12u1",
"3.0.17-1~deb12u1",
"3.0.17-1~deb12u2",
"3.0.17-1~deb12u3",
"3.0.18-1~deb12u1",
"3.0.18-1~deb12u2",
"3.0.19-1~deb12u1",
"3.0.19-1~deb12u2",
"3.0.20-1~deb12u1",
"3.0.20-1~deb12u2",
"3.0.22-1~deb12u1",
"3.0.9-1"
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75805.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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}
],
"package": {
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"purl": "pkg:deb/debian/openssl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
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"3.5.6-1~deb13u1",
"3.5.6-1~deb13u2",
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"3.5.7-1~deb13u2"
],
"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.5-1"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.5.1-1",
"3.5.2-1",
"3.5.3-1",
"3.5.4-1",
"3.5.4-1~deb13u1",
"3.5.4-1~deb13u2",
"3.5.5-1",
"3.5.5-1~deb13u1",
"3.5.5-1~deb13u2",
"3.5.6-1~deb13u1",
"3.5.6-1~deb13u2",
"3.5.7-1~deb13u1",
"3.5.7-1~deb13u2",
"3.5.7-1~deb13u3",
"3.6.0-1",
"3.6.0-2",
"3.6.0~~alpha1-1",
"3.6.0~~beta1-1",
"3.6.1-1",
"3.6.1-2",
"3.6.1-3",
"3.6.2-1",
"3.6.3-1",
"3.6.4-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75805.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T05:00:09.634753091Z",
"provider": "osv",
"upstream": [
"CVE-2026-75805"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-75805"
]
},
"related_cves": [
{
"value": "CVE-2026-75805",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 107901,
"published_at": "2026-09-29T16:17:11.063+00:00"
}