CVE-2026-59930

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 8.8% of scored records. A rank, not a probability.

NVD base score

4.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

NVD analysis status

Analyzed. NVD last modified this record on 2026-07-09.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-07-08 16:13Z1 MO AGO

Last updated

2026-07-09 13:54Z1 MO AGO

Reserved

2026-07-07

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 4.3)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weaknesses

• CWE-345Insufficient Verification of Data AuthenticityClass
• CWE-1284Improper Validation of Specified Quantity in InputBase
• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.2

Document digest

151d5ad0d43e57943ff0812ce729be706f1ed61bc34de1afb1d560926431a11f

• github.comhttps://github.com/lepture/mistune/security/advisories/GHSA-2hm2-hc3v-44h9x_refsource_CONFIRM
• github.comhttps://github.com/lepture/mistune/commit/c4093c4742ed0d10d9332fb8edb455869b7b581bx_refsource_MISC
• github.comhttps://github.com/lepture/mistune/releases/tag/v3.3.0x_refsource_MISC