CVE-2018-1000883: Elixir Plug Plug version All contains a Header Injection vulnerability in Connection that can result in Given

Routine

MEDIUM 6.5UPGRADE

CVE-2018-1000883 is a medium-severity flaw (CVSS 6.5) affecting plug. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Elixir Plug Plug version All contains a Header Injection vulnerability in Connection that can result in Given a cookie value, Headers can be added. This attack appear to be exploitable via Crafting a value to be sent as a cookie. This vulnerability appears to have been fixed in >= 1.3.5 or ~> 1.2.5 or ~> 1.1.9 or ~> 1.0.6.

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	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-12-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: plug project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-20 21:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

plug project plug UPGRADE

Affected: > 1.0.6 and <= 1.1.9 · > 1.1.9 and <= 1.2.5 · >= 1.2.5 and < 1.3.5 · >= 1.3.5

Fixed in: 1.3.5

Safe to downgrade to: a release before 1.2.5

1. Check installed version

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

2. UPGRADE to 1.3.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade plug

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 1.2.5 (Debian / Ubuntu)

apt-cache madison plug sudo apt install plug=<VERSION_BEFORE_1.2.5> sudo apt-mark hold plug

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

dnf --showduplicates list plug sudo dnf downgrade plug-<VERSION_BEFORE_1.2.5> sudo dnf versionlock add plug

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-2018-1000883?

plug: upgrade to 1.3.5. Exact commands for each OS are on this page.

Is CVE-2018-1000883 being exploited?

CVE-2018-1000883 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-2018-1000883 affect?

CVE-2018-1000883 affects plug. Severity is medium (CVSS 6.5). Elixir Plug Plug version All contains a Header Injection vulnerability in Connection that can result in Given a cookie value, Headers can be added. This attack appear to be exploitable via Crafting a value to be sent as a cookie. This vulne

How urgent is CVE-2018-1000883?

Priority 39/100. No elevated risk signals yet.

Related CVEs

CVE-2017-1000053 HIGH 8.1 UPGRADE Elixir Plug before v1.0.4, v1.1.7, v1.2.3 and v1.3.2 is vulnerable to arbitrary code execution in the deserial
CVE-2017-1000052 HIGH 7.8 UPGRADE Elixir Plug before v1.0.4, v1.1.7, v1.2.3 and v1.3.2 is vulnerable to null byte injection in the Plug.Static c

References

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