ANT-2026-9SZMPW41 · MapServer · Heap Buffer Overflow

heap-buffer-overflow medium CVE-2026-33721 Severity Claude medium · Security research firm medium · Maintainer unknown Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Trail of Bits. ANT-2026-9SZMPW41: Heap buffer...

CVE-2026-33721 MapServer has heap buffer overflow in SLD `Categorize` Threshold parsing

MapServer is a system for developing web-based GIS applications. Starting in version 4.2 and prior to version 8.6.1, a heap-buffer-overflow write in MapServer’s SLD Styled Layer Descriptor parser lets a remote, unauthenticated attacker crash the MapServer process by sending a crafted SLD with mor...