CVE-2026-22551: In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, trigger

Q: How do I fix CVE-2026-22551?

theia: upgrade to 1.71.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-22551 being exploited?

CVE-2026-22551 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-2026-22551 affect?

CVE-2026-22551 affects theia. Severity is medium (CVSS 6.5). In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs without restriction. Combined with prompt injection in a malicious workspace, an atta

Q: How urgent is CVE-2026-22551?

Priority 29/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-22551 is a medium-severity flaw (CVSS 6.5) affecting theia. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs without restriction. Combined with prompt injection in a malicious workspace, an attacker could induce the AI agent to construct image URLs encoding sensitive information from the workspace or conversation context, exfiltrating it to attacker-controlled servers. The workspace trust enforcement

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-201, CWE-829
Published	2026-06-18
Last modified	2026-10-26

Publisher (CNA): Eclipse Foundation · Vendor: eclipse

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

Am I affected?

Timeline

2026-06-18 16:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

eclipse theia UPGRADE

Affected: < 1.71.0

Fixed in: 1.71.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.71.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade theia

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-2026-22551?

theia: upgrade to 1.71.0. Exact commands for each OS are on this page.

Is CVE-2026-22551 being exploited?

CVE-2026-22551 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-2026-22551 affect?

CVE-2026-22551 affects theia. Severity is medium (CVSS 6.5). In Eclipse Theia versions prior to 1.71.0, the AI chat rendered Markdown image tags from AI responses, triggering HTTP requests to arbitrary external URLs without restriction. Combined with prompt injection in a malicious workspace, an atta

How urgent is CVE-2026-22551?

Priority 29/100. No elevated risk signals yet.

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CVE-2026-60009 HIGH 8.8 UPGRADE In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend binds `POST /file-upload
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References

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