CVE-2026-42261: PromptHub is an all-in-one AI toolbox for prompt, skill, and agent management

Routine

HIGH 7.1UPGRADE

CVE-2026-42261 is a high-severity flaw (CVSS 7.1) affecting prompthub. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PromptHub is an all-in-one AI toolbox for prompt, skill, and agent management. From version 0.4.9 to before version 0.5.4, apps/web/src/routes/skills.ts exposes an authenticated endpoint POST /api/skills/fetch-remote that fetches a user-supplied URL server-side and reflects the response body (up to 5 MB) back to the caller. The SSRF protection in apps/web/src/utils/remote-http.ts (isPrivateIPv6) attempts to block private/loopback destinations, bu

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-20, CWE-693, CWE-918
Published	2026-05-08
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 04:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

legeling prompthub UPGRADE

Affected: >= 0.4.9 and < 0.5.4

Fixed in: 0.5.4

Safe to downgrade to: a release before 0.4.9

1. Check installed version

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

2. UPGRADE to 0.5.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade prompthub

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.4.9 (Debian / Ubuntu)

apt-cache madison prompthub sudo apt install prompthub=<VERSION_BEFORE_0.4.9> sudo apt-mark hold prompthub

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list prompthub sudo dnf downgrade prompthub-<VERSION_BEFORE_0.4.9> sudo dnf versionlock add prompthub

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-2026-42261?

prompthub: upgrade to 0.5.4. Exact commands for each OS are on this page.

Is CVE-2026-42261 being exploited?

CVE-2026-42261 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-2026-42261 affect?

CVE-2026-42261 affects prompthub. Severity is high (CVSS 7.1). PromptHub is an all-in-one AI toolbox for prompt, skill, and agent management. From version 0.4.9 to before version 0.5.4, apps/web/src/routes/skills.ts exposes an authenticated endpoint POST /api/skills/fetch-remote that fetches a user-sup

How urgent is CVE-2026-42261?

Priority 33/100. High severity; Public exploit reference

References

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