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CVE-2026-55078: Coder allows organizations to provision remote development environments via Terraform

35
Routine
MEDIUM 6.5UPGRADE

CVE-2026-55078 is a medium-severity flaw (CVSS 6.5) 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. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `CreateTarFromZip`, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. Exploitation requires authenticated file-upload access and the

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.6% (top 51%)
CISA exploited listNo
WeaknessCWE-409, CWE-770
Published2026-07-07
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: >= 2.17.0 and < 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 2.17.0
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 2.17.0 (Debian / Ubuntu)
apt-cache madison coder sudo apt install coder=<VERSION_BEFORE_2.17.0> 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_2.17.0> 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-2026-55078?

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-2026-55078 being exploited?

CVE-2026-55078 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-2026-55078 affect?

CVE-2026-55078 affects coder. Severity is medium (CVSS 6.5). Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `POST /api/v2/files` converts zip uploads to tar in memory via `Crea

How urgent is CVE-2026-55078?

Priority 35/100. No elevated risk signals yet.

Software pages

Terraform vulnerabilities

Related CVEs

References

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