CVE-2026-26209

cbor2 provides encoding and decoding for the Concise Binary Object Representation CBOR serialization format. Versions prior to 5.9.0 are vulnerable to a Denial of Service DoS attack caused by uncontrolled recursion when decoding deeply nested CBOR structures. This vulnerability affects both the...

Allocation of Resources Without Limits or Throttling

Overview cbor2 is a CBOR deserializer with extensive tag support Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the decoding of CBOR payloads. An attacker can cause the application to crash by submitting deeply nested input that trigger...

PYSEC-2025-90

cbor2 provides encoding and decoding for the Concise Binary Object Representation CBOR serialization format. Starting in version 3.0.0 and prior to version 5.8.0, whhen a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag 28 persist in memory an...

DEBIAN-CVE-2025-68131

cbor2 provides encoding and decoding for the Concise Binary Object Representation CBOR serialization format. Starting in version 3.0.0 and prior to version 5.8.0, whhen a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag 28 persist in memory an...

UBUNTU-CVE-2025-68131

cbor2 provides encoding and decoding for the Concise Binary Object Representation CBOR serialization format. Starting in version 3.0.0 and prior to version 5.8.0, whhen a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag 28 persist in memory an...

CVE-2025-68131

CVE-2025-68131 (cbor2) affects the cbor2 library’s CBORDecoder when reusing a decoder across trust boundaries. Versions 3.0.0–before 5.8.0 may retain shareable-tag (28) values in memory, allowing an attacker-controlled message to read data from earlier decoded messages via the sharedref tag (29)....

CVE-2025-68131 CBORDecoder reuse can leak shareable values across decode calls

cbor2 provides encoding and decoding for the Concise Binary Object Representation CBOR serialization format. Starting in version 3.0.0 and prior to version 5.8.0, whhen a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag 28 persist in memory an...

DEBIAN-CVE-2024-26134

cbor2 provides encoding and decoding for the Concise Binary Object Representation CBOR RFC 8949 serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a...

UBUNTU-CVE-2024-26134

cbor2 provides encoding and decoding for the Concise Binary Object Representation CBOR RFC 8949 serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a...

PT-2024-21293

Name of the Vulnerable Software and Affected Versions cbor2 versions 5.5.1 through 5.6.2 Description The issue concerns a denial-of-service vulnerability in cbor2, which provides encoding and decoding for the Concise Binary Object Representation CBOR serialization format. An attacker can crash a...