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CVE-2023-26303

markdown-it-py crash on null assertions

MEDIUM
5.5
CVSS Score
Published: February 22, 2023 at 11:44 PM UTC
Updated: June 17, 2026 at 05:43 AM UTC
1 product affected across 1 vendorMarkdown IT Py

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Denial of service could be caused to markdown-it-py, before v2.2.0, if an attacker was allowed to force null assertions with specially crafted input.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Markdown IT Py· Executablebooks
95%
v < 2.2.0v < v2.2.0
Affected range stops below 2.2.0, so it looks safe — our inference, not a vendor statement
Affected range stops below v2.2.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Patch
Source: [email protected]
https://github.com/executablebooks/markdown-it-py/commit/ae03c6107dfa18e648f6fdd1280f5b89092d5d49

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-173NVD-CWE-Other

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