{"id":"CVE-2025-6272","aliases":["EUVD-2025-18691","GHSA-rrmw-gv85-w824","PYSEC-2025-186"],"status":"published","title":"wasm3 m3_compile.c MarkSlotAllocated out-of-bounds write","description":"A vulnerability has been found in wasm3 0.5.0 and classified as problematic. This vulnerability affects the function MarkSlotAllocated of the file source/m3_compile.c. The manipulation leads to out-of-bounds write. An attack has to be approached locally. The exploit has been disclosed to the public and may be used.","severity":{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00236,"percentile":0.147,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119","CWE-787"],"published":"2025-06-19T18:00:11Z","modified":"2026-10-28T02:30:50Z","affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pywasm3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.5.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"pywasm3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.5.0"}]}],"versions":["0.0.1","0.0.2","0.4.8","0.4.9","0.5.0"]},{"source":"osv","ecosystem":"PyPI","package":"pywasm3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.5.0"}]}],"versions":["0.0.1","0.0.2","0.4.8","0.4.9","0.5.0"]}],"products":[{"vendor":"wasm3_project","product":"wasm3"}],"references":[{"url":"https://vuldb.com/?id.313276","tags":["vdb-entry","technical-description","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://vuldb.com/?ctiid.313276","tags":["signature","permissions-required","Permissions Required","Third Party Advisory","VDB Entry","report","web"]},{"url":"https://vuldb.com/?submit.593008","tags":["third-party-advisory","Third Party Advisory","VDB Entry","advisory","web"]},{"url":"https://github.com/wasm3/wasm3/issues/531","tags":["issue-tracking","exploit","Exploit","Issue Tracking","report","web"]},{"url":"https://github.com/user-attachments/files/19516600/wasm3_crash.txt","tags":["exploit","Exploit","evidence","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-6272","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/pywasm3/PYSEC-2025-186.yaml","tags":["web"]},{"url":"https://github.com/wasm3/pywasm3/blob/main/wasm3/m3_compile.c#L333","tags":["web"]},{"url":"https://github.com/advisories/GHSA-rrmw-gv85-w824","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/6xxx/CVE-2025-6272.json","tags":["advisory"]},{"url":"https://github.com/wasm3/pywasm3","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-6272","title":"wasm3 m3_compile.c MarkSlotAllocated out-of-bounds write","description":"A vulnerability has been found in wasm3 0.5.0 and classified as problematic. This vulnerability affects the function MarkSlotAllocated of the file source/m3_compile.c. The manipulation leads to out-of-bounds write. An attack has to be approached locally. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-19T18:00:11.51Z","modified":"2025-06-23T19:30:43.645Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"2.0","score":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR","assessor":"cna"}],"cwes":["CWE-787","CWE-119"],"updated_at":"2026-11-02T14:32:40.419293Z"}],"euvd":[{"id":"EUVD-2025-18691","description":"A vulnerability has been found in wasm3 0.5.0 and classified as problematic. This vulnerability affects the function MarkSlotAllocated of the file source/m3_compile.c. The manipulation leads to out-of-bounds write. An attack has to be approached locally. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-19T18:00:11Z","modified":"2025-06-23T19:30:43Z","cvss":[{"version":"4.0","score":4.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"updated_at":"2026-11-02T20:32:17.4539Z"}],"ghsa":[{"id":"GHSA-rrmw-gv85-w824","title":"pywasm3 has Improper Restriction of Operations within the Bounds of a Memory Buffer","description":"A vulnerability has been found in wasm3 0.5.0 and classified as problematic. This vulnerability affects the function MarkSlotAllocated of the file source/m3_compile.c. The manipulation leads to out-of-bounds write. An attack has to be approached locally. 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The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-19T18:15:22Z","modified":"2026-06-17T10:01:30.133Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"version":"2.0","score":1.7,"vector":"AV:L/AC:L/Au:S/C:N/I:N/A:P","level":"low","assessor":"secondary"}],"cwes":["CWE-119","CWE-787"],"updated_at":"2026-11-02T14:11:13.247441Z"}],"osv":[{"id":"CVE-2025-6272","title":"wasm3 m3_compile.c MarkSlotAllocated out-of-bounds write","description":"A vulnerability has been found in wasm3 0.5.0 and classified as problematic. This vulnerability affects the function MarkSlotAllocated of the file source/m3_compile.c. The manipulation leads to out-of-bounds write. An attack has to be approached locally. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-19T18:00:11.51Z","modified":"2026-10-28T02:30:50.554848647Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-119","CWE-787"],"updated_at":"2026-11-02T15:44:51.851511Z"},{"id":"GHSA-rrmw-gv85-w824","title":"pywasm3 has Improper Restriction of Operations within the Bounds of a Memory Buffer","description":"A vulnerability has been found in wasm3 0.5.0 and classified as problematic. This vulnerability affects the function MarkSlotAllocated of the file source/m3_compile.c. The manipulation leads to out-of-bounds write. An attack has to be approached locally. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-19T18:31:47Z","modified":"2026-06-09T19:26:11.380063827Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low"},{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T15:46:56.281047Z"},{"id":"PYSEC-2025-186","description":"A vulnerability has been found in wasm3 0.5.0 and classified as problematic. This vulnerability affects the function MarkSlotAllocated of the file source/m3_compile.c. The manipulation leads to out-of-bounds write. An attack has to be approached locally. The exploit has been disclosed to the public and may be used.","status":"published","published":"2025-06-19T18:15:22Z","modified":"2026-06-10T17:02:32.862102627Z","cvss":[{"version":"4.0","score":1.9,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"updated_at":"2026-11-02T15:52:54.242332Z"}]}}