DEBIAN-CVE-2026-28388
Issue summary: When a delta CRL that contains a Delta CRL Indicator extension is processed a NULL pointer dereference might happen if the required CRL Number extension is missing. Impact summary: A NULL pointer dereference can trigger a crash which leads to a Denial of Service for an application. When CRL processing and delta CRL processing is enabled during X.509 certificate verification, the delta CRL processing does not check whether the CRL Number extension is NULL before dereferencing it. When a malformed delta CRL file is being processed, this parameter can be NULL, causing a NULL pointer dereference. Exploiting this issue requires the X509_V_FLAG_USE_DELTAS flag to be enabled in the verification context, the certificate being verified to contain a freshestCRL extension or the base CRL to have the EXFLAG_FRESHEST flag set, and an attacker to provide a malformed CRL to an application that processes it. The vulnerability is limited to Denial of Service and cannot be escalated to achieve code execution or memory disclosure. For that reason the issue was assessed as Low severity according to our Security Policy. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
DEBIAN-CVE-2026-28388
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-2026-28388
openssl
Source reference: /affected/0/package/name
- Affected versions
- 3.0.10-1
Source reference:
/affected/0/versions3.0.10-1~deb12u1Source reference:
/affected/0/versions3.0.11-1Source reference:
/affected/0/versions3.0.11-1~deb12u1Source reference:
/affected/0/versions3.0.11-1~deb12u2Source reference:
/affected/0/versions3.0.12-1Source reference:
/affected/0/versions3.0.12-2Source reference:
/affected/0/versions3.0.13-1~deb12u1Source reference:
/affected/0/versions3.0.13-1~deb12u2Source reference:
/affected/0/versions3.0.14-1~deb12u1Source reference:
/affected/0/versions3.0.14-1~deb12u2Source reference:
/affected/0/versions3.0.15-1~deb12u1Source reference:
/affected/0/versions3.0.16-1~deb12u1Source reference:
/affected/0/versions3.0.17-1~deb12u1Source reference:
/affected/0/versions3.0.17-1~deb12u2Source reference:
/affected/0/versions3.0.17-1~deb12u3Source reference:
/affected/0/versions3.0.18-1~deb12u1Source reference:
/affected/0/versions3.0.18-1~deb12u2Source reference:
/affected/0/versions3.0.19-1~deb12u1Source reference:
/affected/0/versions3.0.9-1Source reference:
/affected/0/versions - Fixed versions
- 3.0.19-1~deb12u2
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/versions3.5.1-1+deb13u1Source 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/versions3.5.5-1~deb13u1Source reference:
/affected/1/versions - Fixed versions
- 3.5.5-1~deb13u2
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
openssl
Source reference: /affected/2/package/name
- Affected versions
- 3.5.1-1
Source reference:
/affected/2/versions3.5.2-1Source reference:
/affected/2/versions3.5.3-1Source reference:
/affected/2/versions3.5.4-1Source reference:
/affected/2/versions3.5.4-1~deb13u1Source reference:
/affected/2/versions3.5.4-1~deb13u2Source reference:
/affected/2/versions3.5.5-1Source reference:
/affected/2/versions3.5.5-1~deb13u1Source reference:
/affected/2/versions3.5.5-1~deb13u2Source reference:
/affected/2/versions3.5.6-1~deb13u1Source reference:
/affected/2/versions3.5.6-1~deb13u2Source reference:
/affected/2/versions3.5.7-1~deb13u1Source reference:
/affected/2/versions3.5.7-1~deb13u2Source reference:
/affected/2/versions3.5.7-1~deb13u3Source reference:
/affected/2/versions3.6.0-1Source reference:
/affected/2/versions3.6.0-2Source reference:
/affected/2/versions3.6.0~~alpha1-1Source reference:
/affected/2/versions3.6.0~~beta1-1Source reference:
/affected/2/versions3.6.1-1Source reference:
/affected/2/versions3.6.1-2Source reference:
/affected/2/versions3.6.1-3Source reference:
/affected/2/versions - Fixed versions
- 3.6.2-1
Source reference:
/affected/2/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": "3.0.19-1~deb12u2"
}
]
}
],
"package": {
"name": "openssl",
"purl": "pkg:deb/debian/openssl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"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",
"3.0.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28388.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.5-1~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~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28388.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.2-1"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-28388.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55895 · Revision 1
- Added to Heist Feed
- Publisher date