A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.
{
"cna_assigner": "redhat",
"cwe_ids": [
"CWE-125"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102559.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "0:3.6.5-3.el10_2.20"
},
{
"fixed": "0:2.62.3-19.el8_10"
},
{
"fixed": "0:2.62.3-19.el8_10"
},
{
"fixed": "0:2.72.0-16.el9_8.8"
}
],
"source": "AFFECTED_FIELD",
"strategy": "InverseAffectedRanges"
}
]
}
]
}{
"extracted_events": [
{
"cpe": "cpe:2.3:a:gnome:libsoup:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.7.3"
}
],
"source": "CPE_RANGE"
}
]
}
{
"extracted_events": [
{
"cpe": "cpe:2.3:a:gnome:libsoup:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.7.3"
}
],
"source": "CPE_RANGE"
}
]
}