{"id":"CVE-2026-47235","state":"PUBLISHED","title":"SimulationCraft: Heap-Based Buffer Overflow / Out-of-Bounds Write in SimulationCraft's gem_id Array","description":"SimulationCraft is a tool to explore combat mechanics in World of Warcraft. In builds after release-820-01 and before the identified May 7, 2026 nightly, the `bcp_api.cpp` loop over the JSON `sockets` array uses `slot_data[\"sockets\"].Size()` without bounding `gem_idx` by `MAX_GEM_SLOTS`, which is four in `engine/sc_enums.hpp`. The destination `gem_id` and `gem_bonus_id` arrays in `engine/item/item.hpp` have only four elements. More than four socket entries therefore write beyond `gem_id` into the adjacent `gem_bonus_id` vector storage; `bonus_list` entries can also access `gem_bonus_id` out of bounds. Corrupting a vector's `_M_start` pointer causes the `item_t` destructor to free an attacker-influenced pointer during normal cleanup. The advisory reports crashes and code execution demonstrated in a testing environment. Attack inputs can arrive through a malicious `.simc` profile with a `[[equipment]]` section, a compromised addon export, or `Battle.net API` responses modified by an attacker with a privileged network position. The fix is contained in the nightly build identified as simc-1205-01-516b5d7; no containing release tag is available.","publishedAt":"2026-10-28T15:38:21.113Z","updatedAt":"2026-10-29T18:38:47.642Z","severity":{"score":7.5,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["simulationcraft simc"],"affected":[{"vendor":"simulationcraft","product":"simc","versions":[{"version":"< aff85992d284ca4621e784c6b065a271b22f629d","status":"affected"}]}],"references":["https://github.com/simulationcraft/simc/security/advisories/GHSA-wc9c-hfh3-phxx","https://github.com/simulationcraft/simc/commit/aff85992d284ca4621e784c6b065a271b22f629d"],"weaknesses":["CWE-122","CWE-787"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/47xxx/CVE-2026-47235.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-47235","state":"PUBLISHED","datePublished":"2026-10-28T15:38:21.113Z","dateUpdated":"2026-10-29T18:38:47.642Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-18T22:54:18.271Z"},"containers":{"cna":{"title":"SimulationCraft: Heap-Based Buffer Overflow / Out-of-Bounds Write in SimulationCraft's gem_id Array","descriptions":[{"lang":"en","value":"SimulationCraft is a tool to explore combat mechanics in World of Warcraft. In builds after release-820-01 and before the identified May 7, 2026 nightly, the `bcp_api.cpp` loop over the JSON `sockets` array uses `slot_data[\"sockets\"].Size()` without bounding `gem_idx` by `MAX_GEM_SLOTS`, which is four in `engine/sc_enums.hpp`. The destination `gem_id` and `gem_bonus_id` arrays in `engine/item/item.hpp` have only four elements. More than four socket entries therefore write beyond `gem_id` into the adjacent `gem_bonus_id` vector storage; `bonus_list` entries can also access `gem_bonus_id` out of bounds. Corrupting a vector's `_M_start` pointer causes the `item_t` destructor to free an attacker-influenced pointer during normal cleanup. The advisory reports crashes and code execution demonstrated in a testing environment. Attack inputs can arrive through a malicious `.simc` profile with a `[[equipment]]` section, a compromised addon export, or `Battle.net API` responses modified by an attacker with a privileged network position. The fix is contained in the nightly build identified as simc-1205-01-516b5d7; no containing release tag is available."}],"affected":[{"vendor":"simulationcraft","product":"simc","versions":[{"version":"< aff85992d284ca4621e784c6b065a271b22f629d","status":"affected"}]}],"references":[{"url":"https://github.com/simulationcraft/simc/security/advisories/GHSA-wc9c-hfh3-phxx","name":"https://github.com/simulationcraft/simc/security/advisories/GHSA-wc9c-hfh3-phxx","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/simulationcraft/simc/commit/aff85992d284ca4621e784c6b065a271b22f629d","name":"https://github.com/simulationcraft/simc/commit/aff85992d284ca4621e784c6b065a271b22f629d","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"LOW","baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","lang":"en","description":"CWE-122: Heap-based Buffer Overflow","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787: Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-28T15:38:21.113Z"},"source":{"advisory":"GHSA-wc9c-hfh3-phxx","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/simulationcraft/simc/security/advisories/GHSA-wc9c-hfh3-phxx","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-29T18:38:11.836574Z","id":"CVE-2026-47235","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-29T18:38:47.642Z"}}]}}}