CriticalFix available
node-matrix-js-sdk, olm and 1 more products — security advisory
The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.
- Products
- node-matrix-js-sdk, olm, thunderbird
- Affected versions
- 0.9.2-1, 1:52.4.0+build1-0ubuntu2, 1:52.6.0+build1-0ubuntu1, 1:52.7.0+build1-0ubuntu1, 1:52.8.0+build1-0ubuntu0.18.04.1, 1:52.9.1+build3-0ubuntu0.18.04.1, 1:60.2.1+build1-0ubuntu0.18.04.2, 1:60.4.0+build2-0ubuntu0.18.04.1, 1:60.5.1+build2-0ubuntu0.18.04.1, 1:60.6.1+build2-0ubuntu0.18.04.1, 1:60.7.0+build1-0ubuntu0.18.04.1, 1:60.7.1+build1-0ubuntu0.18.04.1, 1:60.7.2+build2-0ubuntu0.18.04.1, 1:60.8.0+build1-0ubuntu0.18.04.1, 1:60.9.0+build1-0ubuntu0.18.04.1, 1:68.1.2+build1-0ubuntu1, 1:68.1.2+build1-0ubuntu2, 1:68.10.0+build1-0ubuntu0.18.04.1, 1:68.10.0+build1-0ubuntu0.20.04.1, 1:68.2.1+build1-0ubuntu0.18.04.1, 1:68.2.1+build1-0ubuntu1, 1:68.2.2+build1-0ubuntu0.18.04.1, 1:68.2.2+build1-0ubuntu1, 1:68.3.0+build2-0ubuntu1, 1:68.3.1+build1-0ubuntu2, 1:68.4.1+build1-0ubuntu0.18.04.1, 1:68.4.1+build1-0ubuntu1, 1:68.4.2+build2-0ubuntu1, 1:68.5.0+build1-0ubuntu1, 1:68.6.0+build2-0ubuntu1, 1:68.7.0+build1-0ubuntu0.18.04.1, 1:68.7.0+build1-0ubuntu1, 1:68.7.0+build1-0ubuntu2, 1:68.8.0+build2-0ubuntu0.18.04.2, 1:68.8.0+build2-0ubuntu0.20.04.2, 1:78.11.0+build1-0ubuntu0.18.04.2, 1:78.11.0+build1-0ubuntu0.20.04.2, 1:78.13.0+build1-0ubuntu0.18.04.1, 1:78.13.0+build1-0ubuntu0.20.04.2, 1:78.14.0+build1-0ubuntu0.18.04.1, 1:78.14.0+build1-0ubuntu0.18.04.2, 1:78.14.0+build1-0ubuntu0.20.04.1, 1:78.14.0+build1-0ubuntu0.20.04.2, 1:78.7.1+build1-0ubuntu0.20.04.1, 1:78.8.1+build1-0ubuntu0.18.04.1, 1:78.8.1+build1-0ubuntu0.20.04.1, 1:91.1.2+build1-0ubuntu1, 1:91.3.0+build2-0ubuntu1, 1:91.3.1+build1-0ubuntu1, 1:91.3.2+build1-0ubuntu1, 1:91.4.0+build1.1-0ubuntu1, 1:91.4.0+build2-0ubuntu1, 2.2.2+git20170526.0fd768e+dfsg-1, 3.1.3+dfsg-2, 3.1.3+dfsg-2build1, 3.1.3+dfsg-2build2, 3.1.3+dfsg-2ubuntu0.1~esm1, 3.2.10~dfsg-4ubuntu1, 3.2.10~dfsg-5ubuntu1, 3.2.10~dfsg-6ubuntu1, 3.2.13~dfsg-1ubuntu1, 3.2.15~dfsg-1ubuntu1, 3.2.16+dfsg-2, 3.2.16+dfsg-3, 3.2.16+dfsg-5, 3.2.16+dfsg-6, 3.2.1~dfsg-7ubuntu2, 3.2.1~dfsg-7ubuntu3, 9.11.0+~cs9.9.16-1, 9.11.0+~cs9.9.16-2, 9.3.0+~cs9.9.16-2
- Fixed versions
- 1:91.5.0+build1-0ubuntu0.18.04.1, 1:91.5.0+build1-0ubuntu0.20.04.1, 1:91.5.0+build1-0ubuntu1
- CVEs
- CVE-2021-44538
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:35 UTC · Revision 1
Source evidence
The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.
osv:UBUNTU-CVE-2021-44538
thunderbird
Fixed versions: 1:91.5.0+build1-0ubuntu0.18.04.1
olm
Fixed versions: Not specified
thunderbird
Fixed versions: 1:91.5.0+build1-0ubuntu0.20.04.1
node-matrix-js-sdk
Fixed versions: Not specified
olm
Fixed versions: Not specified
node-matrix-js-sdk
Fixed versions: Not specified
olm
Fixed versions: Not specified
thunderbird
Fixed versions: 1:91.5.0+build1-0ubuntu1
node-matrix-js-sdk
Fixed versions: Not specified
olm
Fixed versions: Not specified
olm
Fixed versions: Not specified
olm
Fixed versions: Not specified
olm
Fixed versions: Not specified
Complete source record
{
"id": "53dba11a105407821dfdbf62607343ddffb2a3ace73a975a6e515b28a7d6a3cb",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-44538",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-44538",
"summary": "The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequence of messages to manipulate the state of the receiver's session in such a way that, for some buffer sizes, a buffer overflow happens on a call to olm_session_describe. Furthermore, safe buffer sizes were undocumented. The overflow content is partially controllable by the attacker and limited to ASCII spaces and digits. The known affected products are Element Web And SchildiChat Web.",
"evidence": "osv:UBUNTU-CVE-2021-44538",
"products": [
{
"name": {
"value": "thunderbird",
"evidence": "/affected/0/package/name"
},
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{
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"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:52.4.0+build1-0ubuntu2",
"evidence": "/affected/0/versions"
},
{
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{
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{
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{
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{
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{
"value": "1:60.4.0+build2-0ubuntu0.18.04.1",
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},
{
"value": "1:60.5.1+build2-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
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{
"value": "1:60.6.1+build2-0ubuntu0.18.04.1",
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{
"value": "1:60.7.0+build1-0ubuntu0.18.04.1",
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{
"value": "1:60.7.1+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
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{
"value": "1:60.7.2+build2-0ubuntu0.18.04.1",
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{
"value": "1:60.8.0+build1-0ubuntu0.18.04.1",
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{
"value": "1:60.9.0+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
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{
"value": "1:68.2.1+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:68.2.2+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:68.4.1+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:68.7.0+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:68.8.0+build2-0ubuntu0.18.04.2",
"evidence": "/affected/0/versions"
},
{
"value": "1:68.10.0+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:78.8.1+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:78.11.0+build1-0ubuntu0.18.04.2",
"evidence": "/affected/0/versions"
},
{
"value": "1:78.13.0+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:78.14.0+build1-0ubuntu0.18.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:78.14.0+build1-0ubuntu0.18.04.2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "olm",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.2+git20170526.0fd768e+dfsg-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "thunderbird",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:91.5.0+build1-0ubuntu0.20.04.1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:68.1.2+build1-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.1.2+build1-0ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.2.1+build1-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.2.2+build1-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.3.0+build2-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.3.1+build1-0ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.4.1+build1-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.4.2+build2-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.5.0+build1-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.6.0+build2-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.7.0+build1-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.7.0+build1-0ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.8.0+build2-0ubuntu0.20.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:68.10.0+build1-0ubuntu0.20.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:78.7.1+build1-0ubuntu0.20.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:78.8.1+build1-0ubuntu0.20.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:78.11.0+build1-0ubuntu0.20.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:78.13.0+build1-0ubuntu0.20.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:78.14.0+build1-0ubuntu0.20.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:78.14.0+build1-0ubuntu0.20.04.2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "node-matrix-js-sdk",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.2-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "olm",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.1.3+dfsg-2",
"evidence": "/affected/4/versions"
},
{
"value": "3.1.3+dfsg-2build1",
"evidence": "/affected/4/versions"
},
{
"value": "3.1.3+dfsg-2build2",
"evidence": "/affected/4/versions"
},
{
"value": "3.1.3+dfsg-2ubuntu0.1~esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "node-matrix-js-sdk",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.3.0+~cs9.9.16-2",
"evidence": "/affected/5/versions"
},
{
"value": "9.11.0+~cs9.9.16-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "olm",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.2.1~dfsg-7ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "3.2.1~dfsg-7ubuntu3",
"evidence": "/affected/6/versions"
},
{
"value": "3.2.10~dfsg-4ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "3.2.10~dfsg-5ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "3.2.10~dfsg-6ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "thunderbird",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:91.5.0+build1-0ubuntu1",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": [
{
"value": "1:91.1.2+build1-0ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "1:91.3.0+build2-0ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "1:91.3.1+build1-0ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "1:91.3.2+build1-0ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "1:91.4.0+build1.1-0ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "1:91.4.0+build2-0ubuntu1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "node-matrix-js-sdk",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.11.0+~cs9.9.16-2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "olm",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.2.13~dfsg-1ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "3.2.15~dfsg-1ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "3.2.16+dfsg-2",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "olm",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.2.16+dfsg-3",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "olm",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.2.16+dfsg-5",
"evidence": "/affected/11/versions"
},
{
"value": "3.2.16+dfsg-6",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "olm",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.2.16+dfsg-3",
"evidence": "/affected/12/versions"
},
{
"value": "3.2.16+dfsg-5",
"evidence": "/affected/12/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2021-44538",
"aliases": [
"UBUNTU-CVE-2021-44538"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:91.5.0+build1-0ubuntu0.18.04.1"
}
]
}
],
"package": {
"name": "thunderbird",
"purl": "pkg:deb/ubuntu/thunderbird?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1:52.4.0+build1-0ubuntu2",
"1:52.6.0+build1-0ubuntu1",
"1:52.7.0+build1-0ubuntu1",
"1:52.8.0+build1-0ubuntu0.18.04.1",
"1:52.9.1+build3-0ubuntu0.18.04.1",
"1:60.2.1+build1-0ubuntu0.18.04.2",
"1:60.4.0+build2-0ubuntu0.18.04.1",
"1:60.5.1+build2-0ubuntu0.18.04.1",
"1:60.6.1+build2-0ubuntu0.18.04.1",
"1:60.7.0+build1-0ubuntu0.18.04.1",
"1:60.7.1+build1-0ubuntu0.18.04.1",
"1:60.7.2+build2-0ubuntu0.18.04.1",
"1:60.8.0+build1-0ubuntu0.18.04.1",
"1:60.9.0+build1-0ubuntu0.18.04.1",
"1:68.2.1+build1-0ubuntu0.18.04.1",
"1:68.2.2+build1-0ubuntu0.18.04.1",
"1:68.4.1+build1-0ubuntu0.18.04.1",
"1:68.7.0+build1-0ubuntu0.18.04.1",
"1:68.8.0+build2-0ubuntu0.18.04.2",
"1:68.10.0+build1-0ubuntu0.18.04.1",
"1:78.8.1+build1-0ubuntu0.18.04.1",
"1:78.11.0+build1-0ubuntu0.18.04.2",
"1:78.13.0+build1-0ubuntu0.18.04.1",
"1:78.14.0+build1-0ubuntu0.18.04.1",
"1:78.14.0+build1-0ubuntu0.18.04.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44538.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "thunderbird",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "thunderbird-gnome-support",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "thunderbird-mozsymbols",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "xul-ext-calendar-timezones",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "xul-ext-gdata-provider",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
},
{
"binary_name": "xul-ext-lightning",
"binary_version": "1:91.5.0+build1-0ubuntu0.18.04.1"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "olm",
"purl": "pkg:deb/ubuntu/olm?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"2.2.2+git20170526.0fd768e+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44538.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libolm2",
"binary_version": "2.2.2+git20170526.0fd768e+dfsg-1"
},
{
"binary_name": "python-olm",
"binary_version": "2.2.2+git20170526.0fd768e+dfsg-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:91.5.0+build1-0ubuntu0.20.04.1"
}
]
}
],
"package": {
"name": "thunderbird",
"purl": "pkg:deb/ubuntu/thunderbird?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1:68.1.2+build1-0ubuntu1",
"1:68.1.2+build1-0ubuntu2",
"1:68.2.1+build1-0ubuntu1",
"1:68.2.2+build1-0ubuntu1",
"1:68.3.0+build2-0ubuntu1",
"1:68.3.1+build1-0ubuntu2",
"1:68.4.1+build1-0ubuntu1",
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],
"modified": "2026-10-17T12:55:47.650135397Z",
"provider": "osv",
"upstream": [
"CVE-2021-44538"
],
"references": [
"https://ubuntu.com/security/CVE-2021-44538",
"https://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdk/",
"https://www.mozilla.org/en-US/security/advisories/mfsa2021-55/#CVE-2021-44538",
"https://ubuntu.com/security/notices/USN-5246-1",
"https://ubuntu.com/security/notices/USN-5248-1",
"https://www.cve.org/CVERecord?id=CVE-2021-44538"
]
},
"related_cves": [
{
"value": "CVE-2021-44538",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354097,
"published_at": "2021-12-14T14:15:00+00:00"
}