Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U N N H 7.5 .0032 24.9 —
AFFECTED Product Versions Fixed MapServer >= 6.4.0, < 8.6.3 – —
TIMELINE May 8 Reserved by GitHub_M May 27 EXPLOIT PUBLISHED — CVE-2026-45104 (MapServer). Public exploit reference added. May 27 Published (CNA: GitHub_M)
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 <Rule> carrying <ElseFilter/> — 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.
| Date | Event | Detail |
|---|---|---|
| May 8, 2026 | Reserved | Reserved by GitHub_M |
| May 27, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-45104 (MapServer). Public exploit reference added. |
| May 27, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| MapServer | MapServer | — | >= 6.4.0, < 8.6.3 | — |
Authoritative record: CVE-2026-45104 at cve.org
Vendors: mapserver
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45104 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.