CVE-2026-27627: Karakeep is a elf-hostable bookmark-everything app

This month

HIGH 8.2DOWNGRADE

CVE-2026-27627 is a high-severity flaw (CVSS 8.2) affecting karakeep. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Karakeep is a elf-hostable bookmark-everything app. In version 0.30.0, when the Reddit metascraper plugin returns `readableContentHtml`, the HTML parsing subprocess uses it directly without running it through DOMPurify. Every other content source in the crawler goes through Readability + DOMPurify, but the Reddit path skips both. Since this content ends up in `dangerouslySetInnerHTML` in the reader view, any malicious HTML in the Reddit response

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-02-25
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: localhostlabs

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

Am I affected?

Timeline

2026-02-25 04:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

localhostlabs karakeep DOWNGRADE

Affected: 0.30.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.30.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.30.0 (Debian / Ubuntu)

apt-cache madison karakeep sudo apt install karakeep=<VERSION_BEFORE_0.30.0> sudo apt-mark hold karakeep

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list karakeep sudo dnf downgrade karakeep-<VERSION_BEFORE_0.30.0> sudo dnf versionlock add karakeep

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-2026-27627?

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

Is CVE-2026-27627 being exploited?

CVE-2026-27627 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-2026-27627 affect?

CVE-2026-27627 affects karakeep. Severity is high (CVSS 8.2). Karakeep is a elf-hostable bookmark-everything app. In version 0.30.0, when the Reddit metascraper plugin returns `readableContentHtml`, the HTML parsing subprocess uses it directly without running it through DOMPurify. Every other content

How urgent is CVE-2026-27627?

Priority 41/100. High severity; Public exploit reference

References

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