CVE-2025-64076 describes multiple vulnerabilities in the cbor2 library, specifically in versions up to 5.7.0, affecting its C extension decoder. These include an integer underflow leading to an out-of-bounds read and a memory leak due to unreleased Python object references, both occurring within the decode_definite_long_string() function. The vulnerabilities carry a CVSS score of 7.5 (High), indicating a critical risk of denial of service through process crashes or memory exhaustion. Exploitation is remote, unauthenticated, and requires specially-crafted CBOR data. There is currently no evidence of active exploitation, public exploit code, or significant community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 5.7.0CPE matchmatch criteria | cpe:2.3:a:agronholm:cbor2:*:*:*:*:*:python:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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