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CVE-2026-45104

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 t
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:190a37456736b4880e5d5e934f0440a0b1ae1cb948bf62cf56aae3441c930cff
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:50188fbb5170220f836f03e5378a8550357f5bb22ec312de16d36abba54469a3 · sha256:3262d94cb73e6531… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-129","description":"CWE-129: Improper Validation of Array Index","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:50188fbb5170220f836f03e5378a8550357f5bb22ec312de16d36abba54469a3 · sha256:3262d94cb73e6531… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"MapServer","vendor":"MapServer","versions":[{"status":"affected","version":">= 6.4.0, < 8.6.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:50188fbb5170220f836f03e5378a8550357f5bb22ec312de16d36abba54469a3 · sha256:3262d94cb73e6531… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:50188fbb5170220f836f03e5378a8550357f5bb22ec312de16d36abba54469a3 · sha256:3262d94cb73e6531… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-476","description":"CWE-476: NULL Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:50188fbb5170220f836f03e5378a8550357f5bb22ec312de16d36abba54469a3 · sha256:3262d94cb73e6531… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-129","description":"CWE-129: Improper Validation of Array Index","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:50188fbb5170220f836f03e5378a8550357f5bb22ec312de16d36abba54469a3 · sha256:3262d94cb73e6531… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/MapServer/MapServer/security/advisories/GHSA-4h8g-378q-r75m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:50188fbb5170220f836f03e5378a8550357f5bb22ec312de16d36abba54469a3 · sha256:3262d94cb73e6531… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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