High
mapserver — security advisory
MapServer is a system for developing web-based GIS applications. From 6.4.0 to before 8.6.3, msSLDParseUserStyle always calls _SLDApplyRuleValues(psRule, psLayer, 1); for any carrying — it assumes msSLDParseRule added one class. When the rule has no symbolizer (a structurally valid SLD), msSLDParseRule adds zero, and _SLDApplyRuleValues ends up indexing _class[-1], resulting in a NULL pointer dereference. A 200-byte well-formed SLD via the WMS SLD_BODY= parameter is enough to trigger this, no auth required. This vulnerability is fixed in 8.6.3.
- Products
- mapserver
- Affected versions
- 7.0.0-4build1, 7.0.0-5ubuntu1, 7.0.0-7, 7.0.0-8, 7.0.0-8build1, 7.0.0-9, 7.0.0-9ubuntu1, 7.0.0-9ubuntu2, 7.0.0-9ubuntu3, 7.0.0-9ubuntu3.1, 7.0.6-2build1, 7.0.7-1, 7.0.7-1build1, 7.0.7-1build2, 7.4.1-1build1, 7.4.1-1build3, 7.4.2-1, 7.4.2-1build1, 7.4.3-1, 7.4.3-1build2, 7.4.3-2, 7.4.3-2build1, 7.6.3-1~exp1ubuntu1, 7.6.4-2, 7.6.4-2build2, 8.0.1-2build1, 8.0.1-2build2, 8.0.1-2build3, 8.0.1-2build5, 8.0.1-4ubuntu1, 8.0.1-4ubuntu2, 8.4.0-1build1, 8.4.0-4, 8.4.0-4build1, 8.4.1-1, 8.4.1-1build1, 8.4.1-2, 8.4.1-2build1, 8.6.0-1, 8.6.0-1build1, 8.6.4-1, 8.6.5-1, 8.6.5-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45104
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:05 UTC · Revision 1
Source evidence
MapServer is a system for developing web-based GIS applications. From 6.4.0 to before 8.6.3, msSLDParseUserStyle always calls _SLDApplyRuleValues(psRule, psLayer, 1); for any carrying — it assumes msSLDParseRule added one class. When the rule has no symbolizer (a structurally valid SLD), msSLDParseRule adds zero, and _SLDApplyRuleValues ends up indexing _class[-1], resulting in a NULL pointer dereference. A 200-byte well-formed SLD via the WMS SLD_BODY= parameter is enough to trigger this, no auth required. This vulnerability is fixed in 8.6.3.
osv:UBUNTU-CVE-2026-45104
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
mapserver
Fixed versions: Not specified
Complete source record
{
"id": "58029c54020dd7e7c8af3e0d9c46b2451889dbdf0ba523c4fb019c303e092651",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-45104",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-45104",
"summary": "MapServer is a system for developing web-based GIS applications. From 6.4.0 to before 8.6.3, msSLDParseUserStyle always calls _SLDApplyRuleValues(psRule, psLayer, 1); for any carrying — it assumes msSLDParseRule added one class. When the rule has no symbolizer (a structurally valid SLD), msSLDParseRule adds zero, and _SLDApplyRuleValues ends up indexing _class[-1], resulting in a NULL pointer dereference. A 200-byte well-formed SLD via the WMS SLD_BODY= parameter is enough to trigger this, no auth required. This vulnerability is fixed in 8.6.3.",
"evidence": "osv:UBUNTU-CVE-2026-45104",
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{
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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},
{
"value": "8.0.1-2build3",
"evidence": "/affected/4/versions"
},
{
"value": "8.0.1-2build5",
"evidence": "/affected/4/versions"
},
{
"value": "8.0.1-4ubuntu1",
"evidence": "/affected/4/versions"
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{
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{
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{
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{
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{
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},
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{
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"evidence": "/affected/6/versions"
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{
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{
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},
{
"name": {
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"evidence": "/affected/7/package/name"
},
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{
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"evidence": "/affected/7/versions"
},
{
"value": "8.4.1-1",
"evidence": "/affected/7/versions"
},
{
"value": "8.4.1-1build1",
"evidence": "/affected/7/versions"
},
{
"value": "8.4.1-2",
"evidence": "/affected/7/versions"
},
{
"value": "8.4.1-2build1",
"evidence": "/affected/7/versions"
},
{
"value": "8.6.0-1",
"evidence": "/affected/7/versions"
},
{
"value": "8.6.0-1build1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-45104",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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},
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},
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},
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"ecosystem": "Ubuntu:26.04:LTS"
},
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"8.4.1-1",
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"8.6.0-1",
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],
"database_specific": {
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},
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{
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"binary_version": "8.6.0-1build1"
},
{
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"binary_version": "8.6.0-1build1"
},
{
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"binary_version": "8.6.0-1build1"
},
{
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},
{
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"binary_version": "8.6.0-1build1"
},
{
"binary_name": "php-mapscript-ng",
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},
{
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}
]
}
}
],
"modified": "2026-10-17T13:00:10.218880988Z",
"provider": "osv",
"upstream": [
"CVE-2026-45104"
],
"references": [
"https://ubuntu.com/security/CVE-2026-45104",
"https://www.cve.org/CVERecord?id=CVE-2026-45104",
"https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75m"
]
},
"related_cves": [
{
"value": "CVE-2026-45104",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360382,
"published_at": "2026-05-27T20:16:00+00:00"
}