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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-12478",
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"state": "PUBLISHED",
"assignerShortName": "redhat",
"dateReserved": "2026-06-16T21:25:02.817Z",
"datePublished": "2026-07-14T09:26:19.184Z",
"dateUpdated": "2026-11-05T17:02:42.793Z"
},
"containers": {
"cna": {
"title": "Libsoup: incomplete fix for cve-2026-0716: out-of-bounds read in libsoup websocket frame processing (unmasked path)",
"metrics": [
{
"other": {
"content": {
"value": "Moderate",
"namespace": "https://access.redhat.com/security/updates/classification/"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L",
"version": "3.1"
},
"format": "CVSS"
}
],
"descriptions": [
{
"lang": "en",
"value": "The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0."
}
],
"affected": [
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 10",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libsoup3",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:enterprise_linux:10"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 6",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libsoup",
"defaultStatus": "unaffected",
"cpes": [
"cpe:/o:redhat:rhel_els:6"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 7",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libsoup",
"defaultStatus": "affected",
"cpes": [
"cpe:/o:redhat:rhel_els:7"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libsoup",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:enterprise_linux:8"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 9",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "libsoup",
"defaultStatus": "affected",
"cpes": [
"cpe:/a:redhat:enterprise_linux:9"
]
}
],
"references": [
{
"url": "https://access.redhat.com/security/cve/CVE-2026-12478",
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
]
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2489655",
"name": "RHBZ#2489655",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
]
},
{
"url": "https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518"
}
],
"datePublic": "2026-04-27T00:00:00.000Z",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
}
],
"x_redhatCweChain": "CWE-125: Out-of-bounds Read",
"workarounds": [
{
"lang": "en",
"value": "To mitigate this issue, applications utilizing libsoup's WebSocket support should ensure that the `max_incoming_payload_size` is explicitly set to a non-zero value. This prevents the library from processing WebSocket frames with an unset or zero maximum payload size, which can lead to out-of-bounds reads. Consult application-specific documentation for configuring libsoup parameters."
}
],
"timeline": [
{
"lang": "en",
"time": "2026-06-16T21:33:08.458Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-04-27T00:00:00.000Z",
"value": "Made public."
}
],
"credits": [
{
"lang": "en",
"value": "Red Hat would like to thank Adel Bouachraoui and Gerard Capdevila for reporting this issue."
}
],
"providerMetadata": {
"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"shortName": "redhat",
"dateUpdated": "2026-11-05T17:02:42.793Z"
},
"x_generator": {
"engine": "cvelib 1.8.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-07-15T14:42:08.156943Z",
"id": "CVE-2026-12478",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-07-15T14:42:55.698Z"
}
}
]
}
}