How severe is CVE-2025-68142?

CVE-2025-68142 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-68142 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-68142?

CVE-2025-68142 affects Facelessuser Pymdown Extensions. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-68142?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-68142 have an EU (EUVD) identifier?

Yes. CVE-2025-68142 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203840.

When was CVE-2025-68142 published?

CVE-2025-68142 was published on 2025-12-16 and last updated on 2026-06-17.

CVE-2025-68142

CVE-2025-68142 is a medium-severity vulnerability in Facelessuser Pymdown Extensions with a CVSS 3.x base score of 5.3. 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-1333.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 2.7
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203840
Weakness: CWE-1333
Affected product: Facelessuser Pymdown Extensions
Published: 2025-12-16
Last modified: 2026-06-17

Description

PyMdown Extensions is a set of extensions for the `Python-Markdown` markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension (`pymdownx.blocks.caption`). In systems that take unchecked user content, this could cause long hanges when processing the data if a malicious payload was crafted. This issue is patched in Release 10.16.1. As a workaround, those who process unknown user content without timeouts or other safeguards in place to prevent really large, malicious content being aimed at systems may avoid the use of `pymdownx.blocks.caption` until they're able to upgrade.

Frequently asked questions

What is CVE-2025-68142?: PyMdown Extensions is a set of extensions for the `Python-Markdown` markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension (`pymdownx.blocks.caption`). In systems that take unchecked user content, this could cause long hanges when processing the data if a malicious payload was crafted. This issue is patched in Release 10.16.1. As a workaround, those who process unknown user content without timeouts or other safeguards in place to prevent really large, malicious content being aimed at systems may avoid the use of `pymdownx.blocks.caption` until they're able to upgrade.
How severe is CVE-2025-68142?: CVE-2025-68142 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-68142 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-68142?: CVE-2025-68142 affects Facelessuser Pymdown Extensions. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-68142?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-68142 have an EU (EUVD) identifier?: Yes. CVE-2025-68142 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203840.
When was CVE-2025-68142 published?: CVE-2025-68142 was published on 2025-12-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:facelessuser:pymdown_extensions:*:*:*:*:*:*:*:*

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