CVE-2026-46580: In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace

Q: How do I fix CVE-2026-46580?

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

Q: Is CVE-2026-46580 being exploited?

CVE-2026-46580 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-2026-46580 affect?

CVE-2026-46580 affects theia. Severity is high (CVSS 8.8). In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts. An attacker could craft a malicious reposit

This month

HIGH 8.8UPGRADE

CVE-2026-46580 is a high-severity flaw (CVSS 8.8) 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, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts. An attacker could craft a malicious repository containing prompt template files that, when the workspace was opened in Theia, replaced the AI's system instructions with attacker-controlled content (indirect prompt injection). Combined with other AI chat

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	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-2026-46580?

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

Is CVE-2026-46580 being exploited?

CVE-2026-46580 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-2026-46580 affect?

CVE-2026-46580 affects theia. Severity is high (CVSS 8.8). In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts. An attacker could craft a malicious reposit

How urgent is CVE-2026-46580?

Priority 42/100. High severity

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References

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