CVE-2019-25103: A vulnerability has been found in simple-markdown 0.5.1 and classified as problematic

Q: How do I fix CVE-2019-25103?

simple-markdown: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2019-25103 being exploited?

CVE-2019-25103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-25103 affect?

CVE-2019-25103 affects simple-markdown. Severity is medium (CVSS 4.3). A vulnerability has been found in simple-markdown 0.5.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file simple-markdown.js. The manipulation leads to inefficient regular expression compl

Q: How urgent is CVE-2019-25103?

Priority 30/100. No elevated risk signals yet.

Routine

MEDIUM 4.3DOWNGRADE

CVE-2019-25103 is a medium-severity flaw (CVSS 4.3) affecting simple-markdown. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in simple-markdown 0.5.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file simple-markdown.js. The manipulation leads to inefficient regular expression complexity. The attack can be launched remotely. Upgrading to version 0.5.2 is able to address this issue. The patch is named 89797fef9abb4cab2fb76a335968266a92588816. It is recommended to upgrade the affected compo

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-1333
Published	2023-02-12
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: khanacademy

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-02-12 15:15 UTCPublished CVE record published
2026-06-17 02:31 UTCUpdated Record last modified

khanacademy simple-markdown DOWNGRADE

Affected: 0.5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.1

1. Check installed version

npm ls simple-markdown

2. No fixed release: DOWNGRADE to a release before 0.5.1

npm view simple-markdown versions npm install simple-markdown@"<0.5.1"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-25103?

simple-markdown: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-25103 being exploited?

CVE-2019-25103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-25103 affect?

CVE-2019-25103 affects simple-markdown. Severity is medium (CVSS 4.3). A vulnerability has been found in simple-markdown 0.5.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file simple-markdown.js. The manipulation leads to inefficient regular expression compl

How urgent is CVE-2019-25103?

Priority 30/100. No elevated risk signals yet.

Related CVEs

CVE-2019-25102 MEDIUM 4.3 DOWNGRADE A vulnerability, which was classified as problematic, was found in simple-markdown 0.6.0

References

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