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CVE-2026-55431: Coder allows organizations to provision remote development environments via Terraform

34
Routine
HIGH 7.7UPGRADE

CVE-2026-55431 is a high-severity flaw (CVSS 7.7) affecting coder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `coder open app` opens external workspace-app URLs without validating the scheme or host. When an external app URL contains the `$SESSION_TOKEN` placeholder the CLI replaces it with the user's real session token before handing the URL to the OS open handler. Practical exploitation requires the victim to run

Why this priority

  • High severity

A fixed release or distro patch exists.

Risk facts

CVSS score7.7 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededLow
User interactionRequired
EPSS exploit chance0.3% (top 73%)
CISA exploited listNo
WeaknessCWE-522, CWE-601
Published2026-07-08
Last modified2026-07-08
Publisher (CNA): GitHub, Inc. · Vendor: coder

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Last updated 2026-07-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

coder coder UPGRADE
Affected: < 2.29.17 · >= 2.30.0 and < 2.32.7 · >= 2.33.0 and < 2.33.8 · >= 2.34.0 and < 2.34.2
Fixed in: 2.29.17, 2.32.7, 2.33.8, 2.34.2
Safe to downgrade to: a release before 2.30.0
1. Check installed version
apt-cache policy coder || rpm -q coder || coder --version
2. UPGRADE to 2.29.17 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade coder
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade coder
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 2.30.0 (Debian / Ubuntu)
apt-cache madison coder sudo apt install coder=<VERSION_BEFORE_2.30.0> sudo apt-mark hold coder
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list coder sudo dnf downgrade coder-<VERSION_BEFORE_2.30.0> sudo dnf versionlock add coder
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-2026-55431?

coder: upgrade to 2.29.17, 2.32.7, 2.33.8, 2.34.2. Exact commands for each OS are on this page.

Is CVE-2026-55431 being exploited?

CVE-2026-55431 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-2026-55431 affect?

CVE-2026-55431 affects coder. Severity is high (CVSS 7.7). Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `coder open app` opens external workspace-app URLs without validating the scheme or host. When an e

How urgent is CVE-2026-55431?

Priority 34/100. High severity

Software pages

Terraform vulnerabilities

Related CVEs

References

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