DEBIAN-CVE-2026-63073
Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directly as the format string to `ERR_raise_data()`. Impact summary: A malicious or intercepted CMP endpoint can crash a CMP client that enforces an expected sender or uses a pinned server certificate whose subject becomes the default expected sender. CWE: CWE-134 (Use of Externally-Controlled Format String) Description: When validating a received CMP message, ossl_cmp_msg_check_update() converts the peer-supplied sender distinguished name with X509_NAME_oneline() and passes it directly as the format argument to ERR_raise_data(). Percent characters survive the conversion, so a sender DN such as "CN=%s%n" reaches BIO_vsnprintf() as an attacker-controlled format string with no matching variadic arguments. This path is only reached when the caller configures an expected sender or pins a server certificate, which is the normal configuration for a CMP client validating server responses. Since the attacker controls the format string but none of the variadic arguments, such specifiers as %s and %n dereference or write through unrelated stack contents and crash the client. The reliable consequence is a denial of service, when the response comes from a malicious or intercepted CMP endpoint. There is no controlled memory write, arbitrary-address read, or reliable path to remote code execution. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementati
DEBIAN-CVE-2026-63073
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-63073
openssl
Source reference: /affected/0/package/name
- Affected versions
- 3.5.1-1
Source reference:
/affected/0/versions3.5.1-1+deb13u1Source reference:
/affected/0/versions3.5.2-1Source reference:
/affected/0/versions3.5.3-1Source reference:
/affected/0/versions3.5.4-1Source reference:
/affected/0/versions3.5.4-1~deb13u1Source reference:
/affected/0/versions3.5.4-1~deb13u2Source reference:
/affected/0/versions3.5.5-1Source reference:
/affected/0/versions3.5.5-1~deb13u1Source reference:
/affected/0/versions3.5.5-1~deb13u2Source reference:
/affected/0/versions3.5.6-1~deb13u1Source reference:
/affected/0/versions3.5.6-1~deb13u2Source reference:
/affected/0/versions3.5.7-1~deb13u1Source reference:
/affected/0/versions - Fixed versions
- 3.5.7-1~deb13u2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
openssl
Source reference: /affected/1/package/name
- Affected versions
- 3.5.1-1
Source reference:
/affected/1/versions3.5.2-1Source reference:
/affected/1/versions3.5.3-1Source reference:
/affected/1/versions3.5.4-1Source reference:
/affected/1/versions3.5.4-1~deb13u1Source reference:
/affected/1/versions3.5.4-1~deb13u2Source reference:
/affected/1/versions3.5.5-1Source reference:
/affected/1/versions3.5.5-1~deb13u1Source reference:
/affected/1/versions3.5.5-1~deb13u2Source reference:
/affected/1/versions3.5.6-1~deb13u1Source reference:
/affected/1/versions3.5.6-1~deb13u2Source reference:
/affected/1/versions3.5.7-1~deb13u1Source reference:
/affected/1/versions3.5.7-1~deb13u2Source reference:
/affected/1/versions3.5.7-1~deb13u3Source reference:
/affected/1/versions3.6.0-1Source reference:
/affected/1/versions3.6.0-2Source reference:
/affected/1/versions3.6.0~~alpha1-1Source reference:
/affected/1/versions3.6.0~~beta1-1Source reference:
/affected/1/versions3.6.1-1Source reference:
/affected/1/versions3.6.1-2Source reference:
/affected/1/versions3.6.1-3Source reference:
/affected/1/versions3.6.2-1Source reference:
/affected/1/versions3.6.3-1Source reference:
/affected/1/versions - Fixed versions
- 3.6.4-1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.7-1~deb13u2"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63073.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.4-1"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-63073.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57351 · Revision 1
- Added to Heist Feed
- Publisher date