freerdp: Fix of 2 CVEs
- CVE-2026-33983: fix undefined-behaviour shift and ~80 billion iteration loop (CPU denial of service) in the progressive codec; make progressive_rfx_quant_sub reject components where q1 < q2 instead of letting the BYTE subtraction underflow into a bogus numBits shift exponent, and fail the tile upgrade when it does - CVE-2026-33984: fix out-of-bounds heap write in the CLEAR codec; update CLEAR_VBAR_ENTRY::size only after the pixel buffer realloc succeeded, so a failed realloc can no longer leave an inflated size with the old, smaller buffer
- Products
- freerdp, freerdp-devel, freerdp-libs, libwinpr, libwinpr-devel
- Affected versions
- Not specified
- Fixed versions
- 2.1.1-5.el7_9.tuxcare.els25
- CVEs
- CVE-2026-33983, CVE-2026-33984
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:03 UTC · Revision 1
Source evidence
- CVE-2026-33983: fix undefined-behaviour shift and ~80 billion iteration loop (CPU denial of service) in the progressive codec; make progressive_rfx_quant_sub reject components where q1 < q2 instead of letting the BYTE subtraction underflow into a bogus numBits shift exponent, and fail the tile upgrade when it does - CVE-2026-33984: fix out-of-bounds heap write in the CLEAR codec; update CLEAR_VBAR_ENTRY::size only after the pixel buffer realloc succeeded, so a failed realloc can no longer leave an inflated size with the old, smaller buffer
osv:CLSA-2026-1786029097
freerdp
Fixed versions: 2.1.1-5.el7_9.tuxcare.els25
freerdp-devel
Fixed versions: 2.1.1-5.el7_9.tuxcare.els25
freerdp-libs
Fixed versions: 2.1.1-5.el7_9.tuxcare.els25
libwinpr
Fixed versions: 2.1.1-5.el7_9.tuxcare.els25
libwinpr-devel
Fixed versions: 2.1.1-5.el7_9.tuxcare.els25
Complete source record
{
"id": "b261b668ba965b5ffe00c9765c633d47f41e405d91777270375fcd1658c449dd",
"url": "https://osv.dev/vulnerability/CLSA-2026-1786029097",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "freerdp: Fix of 2 CVEs",
"summary": "- CVE-2026-33983: fix undefined-behaviour shift and ~80 billion iteration loop (CPU denial of service) in the progressive codec; make progressive_rfx_quant_sub reject components where q1 < q2 instead of letting the BYTE subtraction underflow into a bogus numBits shift exponent, and fail the tile upgrade when it does - CVE-2026-33984: fix out-of-bounds heap write in the CLEAR codec; update CLEAR_VBAR_ENTRY::size only after the pixel buffer realloc succeeded, so a failed realloc can no longer leave an inflated size with the old, smaller buffer",
"evidence": "osv:CLSA-2026-1786029097",
"products": [
{
"name": {
"value": "freerdp",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.1.1-5.el7_9.tuxcare.els25",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "freerdp-devel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.1.1-5.el7_9.tuxcare.els25",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "freerdp-libs",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.1.1-5.el7_9.tuxcare.els25",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libwinpr",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.1.1-5.el7_9.tuxcare.els25",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libwinpr-devel",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.1.1-5.el7_9.tuxcare.els25",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1786029097",
"aliases": [
"CLSA-2026-1786029097"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.1-5.el7_9.tuxcare.els25"
}
]
}
],
"package": {
"name": "freerdp",
"purl": "pkg:rpm/tuxcare/freerdp?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786029097.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.1-5.el7_9.tuxcare.els25"
}
]
}
],
"package": {
"name": "freerdp-devel",
"purl": "pkg:rpm/tuxcare/freerdp-devel?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786029097.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.1-5.el7_9.tuxcare.els25"
}
]
}
],
"package": {
"name": "freerdp-libs",
"purl": "pkg:rpm/tuxcare/freerdp-libs?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786029097.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.1-5.el7_9.tuxcare.els25"
}
]
}
],
"package": {
"name": "libwinpr",
"purl": "pkg:rpm/tuxcare/libwinpr?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786029097.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.1-5.el7_9.tuxcare.els25"
}
]
}
],
"package": {
"name": "libwinpr-devel",
"purl": "pkg:rpm/tuxcare/libwinpr-devel?distro=centos-7",
"ecosystem": "TuxCare:CentOS:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos7els/CLSA-2026-1786029097.json"
}
}
],
"modified": "2026-10-26T09:31:42.957177486Z",
"provider": "osv",
"upstream": [
"CVE-2026-33983",
"CVE-2026-33984"
],
"references": [
"https://errata.tuxcare.com/els_os/centos7els/CLSA-2026-1786029097.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33983",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33984"
]
},
"related_cves": [
{
"value": "CVE-2026-33983",
"evidence": "/upstream"
},
{
"value": "CVE-2026-33984",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448217,
"published_at": "2026-08-08T21:14:09+00:00"
}