{"id":"PYSEC-2026-491","summary":"Apache Pyfory python is vulnerable to deserialization of untrusted data","details":"Deserialization of untrusted data in python in pyfory versions 0.12.0 through 0.12.2, or the legacy pyfury versions from 0.1.0 through 0.10.3: allows arbitrary code execution. An application is vulnerable if it reads pyfory serialized data from untrusted sources. An attacker can craft a data stream that selects pickle-fallback serializer during deserialization, leading to the execution of `pickle.loads`, which is vulnerable to remote code execution.\n\nUsers are recommended to upgrade to pyfory version 0.12.3 or later, which has removed pickle fallback serializer and thus fixes this issue.","aliases":["CVE-2025-61622","GHSA-538v-3wq9-4h3r","PYSEC-2026-490"],"modified":"2026-07-01T20:23:02.702735Z","published":"2026-06-29T11:50:37.028397Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61622"},{"type":"WEB","url":"https://github.com/apache/fory/pull/2629"},{"type":"WEB","url":"https://github.com/apache/fory/commit/379b948ecae5c3b849e5bdb3997978c9a163e40b"},{"type":"PACKAGE","url":"https://github.com/apache/fory"},{"type":"WEB","url":"https://github.com/apache/fory/releases/tag/v0.12.3"},{"type":"WEB","url":"https://lists.apache.org/thread/vfn9hp9qt06db5yo1gmj3l114o3o2csd"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/09/29/3"},{"type":"PACKAGE","url":"https://pypi.org/project/pyfury"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-538v-3wq9-4h3r"}],"affected":[{"package":{"name":"pyfury","ecosystem":"PyPI","purl":"pkg:pypi/pyfury"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.1.0"},{"last_affected":"0.10.3"}]}],"versions":["0.10.2","0.10.2rc1","0.10.3","0.2.0","0.2.0a1","0.2.1","0.2.1a1","0.3.0","0.3.0a1","0.3.0a2","0.3.0a3","0.3.1","0.4.0","0.4.1"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/pyfury/PYSEC-2026-491.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}