How severe is CVE-2025-68131?

CVE-2025-68131 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-68131 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-68131?

CVE-2025-68131 affects Agronholm Cbor2. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-68131?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-68131 have an EU (EUVD) identifier?

Yes. CVE-2025-68131 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205866.

When was CVE-2025-68131 published?

CVE-2025-68131 was published on 2025-12-31 and last updated on 2026-06-17.

CVE-2025-68131

CVE-2025-68131 is a high-severity vulnerability in Agronholm Cbor2 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-212.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 5.5
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205866
Weakness: CWE-212
Affected product: Agronholm Cbor2
Published: 2025-12-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2025-68131?: CVE-2025-68131 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-68131 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-68131?: CVE-2025-68131 affects Agronholm Cbor2. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-68131?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-68131 have an EU (EUVD) identifier?: Yes. CVE-2025-68131 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205866.
When was CVE-2025-68131 published?: CVE-2025-68131 was published on 2025-12-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:agronholm:cbor2:*:*:*:*:*:python:*:*

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