UBUNTU-CVE-2026-84783
Issue summary: The first concurrent use of the same X.509 certificate by several threads may cause its cached extension data to be freed while another thread is still using it. Impact summary: A remote, unauthenticated peer could crash a multi-threaded TLS client, or a multi-threaded TLS server that requests client certificates, if the first certificate chains built to the same trusted CA certificate are built by several connections at the same time. This is a use-after-free read, which is likely to crash the process, resulting in a Denial of Service. CWE: CWE-416: Use After Free Description: OpenSSL caches the decoded values of a certificate's X.509v3 extensions inside the X509 object the first time they are needed. In OpenSSL 4.0 this cache is built in two phases: the extension values are computed while holding a read lock on the certificate, and the results are then installed into the certificate under a write lock. Because a read lock does not exclude other readers, several threads can compute the cache for the same certificate at the same time. Each thread that subsequently acquires the write lock installs its own results and frees the values installed by the thread before it, even though that earlier thread has already marked the cache as complete and may have returned pointers into it to its caller. A caller still using those pointers then reads freed memory. Any certificate shared between threads is exposed the first time its extensions are decoded. In TLS the certifi
UBUNTU-CVE-2026-84783
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:UBUNTU-CVE-2026-84783
nodejs
Source reference: /affected/0/package/name
- Affected versions
- 12.22.5~dfsg-5ubuntu1
Source reference:
/affected/0/versions12.22.7~dfsg-2ubuntu1Source reference:
/affected/0/versions12.22.7~dfsg-2ubuntu3Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu2Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3.1Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3.2Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3.3Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3.4Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3.5Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3.6Source reference:
/affected/0/versions12.22.9~dfsg-1ubuntu3.6+esm2Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- 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"
}
]
}
],
"package": {
"name": "nodejs",
"purl": "pkg:deb/ubuntu/nodejs?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-84783.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnode72",
"binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
},
{
"binary_name": "nodejs",
"binary_version": "12.22.9~dfsg-1ubuntu3.6+esm2"
}
]
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #51965 · Revision 1
- Added to Heist Feed
- Publisher date