CVE-2019-10905: Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute a

Q: How do I fix CVE-2019-10905?

parsedown: upgrade to 1.7.2. Exact commands for each OS are on this page.

Q: Is CVE-2019-10905 being exploited?

CVE-2019-10905 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-2019-10905 affect?

CVE-2019-10905 affects parsedown. Severity is high (CVSS 8.1). Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific c

Q: How urgent is CVE-2019-10905?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.1REMOTEUPGRADE

CVE-2019-10905 is a high-severity flaw (CVSS 8.1) affecting parsedown. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific class. This occurs because spaces are permitted in code block infostrings, which interferes with the intended behavior of a single class name beginning with the language- substring.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-04-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: parsedown

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

Am I affected?

Timeline

2019-04-06 20:29 UTCPublished CVE record published
2026-06-17 02:11 UTCUpdated Record last modified

parsedown parsedown UPGRADE

Affected: < 1.7.2

Fixed in: 1.7.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy parsedown || rpm -q parsedown || parsedown --version

2. UPGRADE to 1.7.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade parsedown

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade parsedown

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2019-10905?

parsedown: upgrade to 1.7.2. Exact commands for each OS are on this page.

Is CVE-2019-10905 being exploited?

CVE-2019-10905 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-2019-10905 affect?

CVE-2019-10905 affects parsedown. Severity is high (CVSS 8.1). Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific c

How urgent is CVE-2019-10905?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2018-1000162 MEDIUM 6.1 UPGRADE Parsedown version prior to 1.7.0 contains a Cross Site Scripting (XSS) vulnerability in `setMarkupEscaped` for

References

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