CVE-2025-68131
This allows an attacker-controlled message to read data from previously decoded messages if the decoder is reused across trust boundaries.
Does this matter?
Lower severity and a low EPSS score (0.47%). Track it; it rarely justifies an emergency change on its own.
Description
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 and can be accessed by subsequent CBOR messages using the sharedref tag (29). This allows an attacker-controlled message to read data from previously decoded messages if the decoder is reused across trust boundaries. Version 5.8.0 patches the issue.
- CVSS 4.0
- 5.5 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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/M
- EPSS
- 0.47% probability · 39th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-212
- Affected
- agronholm/cbor2
- Source
- security-advisories@github.com
References
- https://github.com/agronholm/cbor2/pull/268Exploit, Patch
- https://github.com/agronholm/cbor2/security/advisories/GHSA-wcj4-jw5j-44whExploit, Vendor Advisory
- https://github.com/agronholm/cbor2/security/advisories/GHSA-wcj4-jw5j-44whExploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.