simple-markdown 0.5.1 simple-markdown.js redos

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability has been found in simple-markdown 0.5.1 and classified as problematic. Affected by this vulnerability is some unknown processing of the file simple-markdown.js. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability.

The weakness was shared 02/11/2023 as 89797fef9abb4cab2fb76a335968266a92588816. It is possible to read the advisory at This vulnerability is known as CVE-2019-25103. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1449.003 according to MITRE ATT&CK.

Upgrading to version 0.5.2 eliminates this vulnerability. The upgrade is hosted for download at Applying the patch 89797fef9abb4cab2fb76a335968266a92588816 is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be upgrading to the latest version. The advisory contains the following remark:

Our inline code regex had overlapping parts in the case of spaces; spaces could be parsed as part of the `\s*`s or as part of the `[\S\s]*`, which leads to catastrophic backtracking in the case of a string




  • open-source

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 4.3
CNA Vector (VulDB): 🔒



VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒


Class: Redos
CWE: CWE-1333 / CWE-400 / CWE-404
ATT&CK: T1449.003

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: simple-markdown 0.5.2
Patch: 89797fef9abb4cab2fb76a335968266a92588816


02/11/2023 Advisory disclosed
02/11/2023 +0 days CVE reserved
02/11/2023 +0 days VulDB entry created
03/10/2023 +27 days VulDB last update


Advisory: 89797fef9abb4cab2fb76a335968266a92588816
Status: Confirmed

CVE: CVE-2019-25103 (🔒)


Created: 02/11/2023 11:39 AM
Updated: 03/10/2023 09:11 AM
Changes: 02/11/2023 11:39 AM (43), 03/10/2023 09:09 AM (2), 03/10/2023 09:11 AM (28)
Complete: 🔍


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