CVE-2026-14978: HashiCorp go-slug 0.4.0 through 0.18.2 could allow a local attacker to bypass .terraformignore exclusions and

Routine

MEDIUM 5.5UPGRADE

CVE-2026-14978 is a medium-severity flaw (CVSS 5.5) affecting go-slug. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HashiCorp go-slug 0.4.0 through 0.18.2 could allow a local attacker to bypass .terraformignore exclusions and cause sensitive files to be included in Terraform slug uploads due to improper handling of Unicode normalization during path matching.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-176
Published	2026-08-19
Last modified	2026-09-04

Publisher (CNA): IBM Corporation · Vendor: hashicorp

Last updated 2026-09-04 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-19 21:16 UTCPublished CVE record published
2026-09-04 16:54 UTCUpdated Record last modified

hashicorp go-slug UPGRADE

Affected: >= 0.4.0 and < 0.18.3

Fixed in: 0.18.3

Safe to downgrade to: a release before 0.4.0

1. Check installed version

apt-cache policy go-slug || rpm -q go-slug || go-slug --version

2. UPGRADE to 0.18.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade go-slug

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade go-slug

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 0.4.0 (Debian / Ubuntu)

apt-cache madison go-slug sudo apt install go-slug=<VERSION_BEFORE_0.4.0> sudo apt-mark hold go-slug

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

dnf --showduplicates list go-slug sudo dnf downgrade go-slug-<VERSION_BEFORE_0.4.0> sudo dnf versionlock add go-slug

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.

Advisories and coverage

Official advisories

HashiCorp Security: HCSEC-2026-31 - Go-slug vulnerable to exclusion bypass in .terraformignore handling 2026-08-20

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-2026-14978?

go-slug: upgrade to 0.18.3. Exact commands for each OS are on this page.

Is CVE-2026-14978 being exploited?

CVE-2026-14978 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-2026-14978 affect?

CVE-2026-14978 affects go-slug. Severity is medium (CVSS 5.5). HashiCorp go-slug 0.4.0 through 0.18.2 could allow a local attacker to bypass .terraformignore exclusions and cause sensitive files to be included in Terraform slug uploads due to improper handling of Unicode normalization during path match

How urgent is CVE-2026-14978?

Priority 20/100. No elevated risk signals yet.

Software pages

Terraform vulnerabilities

References

← Back to latest CVEs