Cloudanix VulnDB

CVE-2025-68131

Medium · 6.5

CBORDecoder reuse can leak shareable values across decode calls

CVSS

6.5

EPSS

0.5%

Published

Dec 31, 2025

CISA due date

—

The record

When 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.

Affected packages

Ecosystem Package Introduced Fixed
PyPI cbor2 3.0.0 5.8.0
Chainguard authentik 0 2025.10.3-r2
Chainguard authentik-fips 0 2025.10.3-r1
Chainguard authentik-go-server 0 2025.10.3-r2
Chainguard authentik-go-server-fips 0 2025.10.3-r0
Chainguard localstack 0 4.12.0-r1
Chainguard localstack-compat 0 4.12.0-r1
Chainguard py3-vllm-cuda-12.4 0 0.13.0-r1
Chainguard py3.10-vllm-cuda-12.4 0 0.13.0-r1
Chainguard py3.12-vllm-cuda-12.4 0 0.13.0-r1
Chainguard tritonserver-backend-vllm-cuda-12.9 0 25.9.0_git20251112-r4
Chainguard tritonserver-backend-vllm-meta-cuda-12.9 0 25.9.0_git20251112-r4
openSUSE:Leap 16.0 python-cbor2 0 5.6.5-160000.4.1
openSUSE:Tumbleweed python-cbor2 0 5.8.0-2.1
pypi cbor2 3.0.0 No fix

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