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TI-2025-41712 Aliases CVE-2025-68131GHSA-wcj4-jw5j-44wh

CBORDecoder reuse can leak shareable values across decode calls

Priority MEDIUM 64CWE-212Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · None · Low
Fix status
Partial Red Hat: 2 fixed, 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00459 40th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Partial cbor2 (agronholm): 5.8.0cbor2 (PyPI): 5.8.0Red Hat: 4 advisoriesRed Hat: 2 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
agronholmcbor23.0.0 to before 5.8.05.8.0Patch availableCNA
—cbor2 (PyPI)3.0.0 to before 5.8.05.8.0Patch availableGHSA-wcj4-jw5j-44wh
  • cbor2 Vendoragronholm Affected 3.0.0 to before 5.8.0 Fixed in 5.8.0 Patch available CNA
  • cbor2 (PyPI) Vendor— Affected 3.0.0 to before 5.8.0 Fixed in 5.8.0 Patch available GHSA-wcj4-jw5j-44wh

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:agronholm:cbor2:*:*:*:*:*:python:*:*3.0.0 to before 5.8.0Vulnerableagronholm
  • cpe:2.3:a:agronholm:cbor2:*:*:*:*:*:python:*:* Versions 3.0.0 to before 5.8.0 Vulnerable ·agronholm

Remediation

  • Fix · CNA cbor2 (agronholm) Fixed in 5.8.0
  • Fix · GHSA-wcj4-jw5j-44wh cbor2 (PyPI) Fixed in 5.8.0 Advisory →

Red Hat 4 advisories

  • RHSA-2026:10184 Released 2026-04-23 · Red Hat rating Important
    RHOAI 2.25.5 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 2.25 registry.redhat.io/rhoai/odh-caikit-nlp-rhel9, registry.redhat.io/rhoai/odh-caikit-tgis-serving-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9 +47
  • RHSA-2026:6762 Released 2026-04-07 · Red Hat rating Important
    Red Hat AI Inference Server 3.2.2 (ROCm)
    • Red Hat AI Inference Server 3.2 registry.redhat.io/rhaiis/vllm-rocm-rhel9
  • RHSA-2026:6761 Released 2026-04-07 · Red Hat rating Important
    Red Hat AI Inference Server Model Optimization Tools 3.2.2 (CUDA)
    • Red Hat AI Inference Server 3.2 registry.redhat.io/rhaiis/model-opt-cuda-rhel9
Show 1 more Red Hat advisories
  • RHSA-2026:5809 Released 2026-03-25 · Red Hat rating Important
    Red Hat AI Inference Server 3.2.2 (cuda-ubi9)
    • Red Hat AI Inference Server 3.2 registry.redhat.io/rhaiis/vllm-cuda-rhel9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat AI Inference ServerAffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix planned: Out of support scope
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat AI Inference Server 3.2Fixed RHSA-2026:5809, RHSA-2026:6761, RHSA-2026:6762
Red Hat OpenShift AI 2.25Fixed RHSA-2026:10184
Not affected: 1 product
  • Red Hat OpenShift AI 2.25

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-68131
  2. 2026-10-03 Alias added: GHSA-wcj4-jw5j-44wh

References

Exploit 2

Advisory 1

Other 3

  • TI-2026-21200 cbor2 has a Denial of Service via Uncontrolled Recursion in cbor2.loads CVSS 3.0HIGH 7.5
  • TI-2024-17225 CBOR2 decoder has potential buffer overflow CVSS 3.1HIGH 7.5
  • TI-2025-39535 Multiple vulnerabilities exist in cbor2 through version 5.7.0 in the… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences