Description
Impact
Special patterns with length > 50K chars can slow down parser significantly.
const md = require('markdown-it')();
md.render(`x ${' '.repeat(150000)} x \nx`);
Patches
Upgrade to v12.3.2+
Workarounds
No.
References
Fix + test sample: https://github.com/markdown-it/markdown-it/commit/ffc49ab46b5b751cd2be0aabb146f2ef84986101
Basic information
- Type
- reviewed
- Severity
- medium
- Advisory on GitHub
- Open advisory ↗
- Repository advisory
- Open repository advisory ↗
- Source code
- Browse source ↗
- Published (advisory)
- 2022-01-12 22:20:22 UTC
- Updated
- 2023-07-24 19:33:44 UTC
- GitHub reviewed
- 2022-01-10 21:50:05 UTC
- NVD published
- 2022-01-10
EPSS Score
| Score |
Percentile |
|
1.11%
|
77.86% |
CVSS Scores
| Base score |
Version |
Severity |
Vector |
|
5.3
|
3.1 |
—
|
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Click to expand
- Attack vector (AV:N)
- Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
- Attack complexity (AC:L)
- Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
- Privileges required (PR:N)
- No account or special rights needed—anonymous or random user is enough.
- User interaction (UI:N)
- Nobody has to click “OK” or open a trap file; it can work without a victim helping.
- Scope (S:U)
- Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
- Confidentiality (C:N)
- Doesn’t really leak secrets in a meaningful way.
- Integrity (I:N)
- Data isn’t meaningfully altered or forged.
- Availability (A:L)
- Might cause slowdowns, glitches, or partial disruption—not a full brick.
|
CWEs
| CWE id |
Name |
|
CWE-400
|
Uncontrolled Resource Consumption |
|
CWE-1333
|
Inefficient Regular Expression Complexity |
Affected packages (1)
Vulnerable version ranges and first patched releases as published by GitHub.
| Ecosystem |
Package |
Vulnerable range |
First patched |
Vulnerable functions |
| npm |
markdown-it |
< 12.3.2 |
12.3.2 |
—
|
cvelogic
Threat Intelligence