CVE-2020-26292: Creeper is an experimental dynamic, interpreted language

Routine

LOW 3.1DOWNGRADE

CVE-2020-26292 is a low-severity flaw (CVSS 3.1) affecting creeper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Creeper is an experimental dynamic, interpreted language. The binary release of Creeper Interpreter 1.1.3 contains potential malware. The compromised binary release was available for a few hours between December 26, 2020 at 3:22 PM EST to December 26, 2020 at 11:00 PM EST. If you used the source code, you are **NOT** affected. This only affects the binary releases. The binary of unknown quality has been removed from the release. If you have downl

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-507
Published	2021-01-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: chatter-social

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

Am I affected?

Timeline

2021-01-04 18:15 UTCPublished CVE record published
2026-06-17 03:08 UTCUpdated Record last modified

chatter-social creeper DOWNGRADE

Affected: 1.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.1.3 (Debian / Ubuntu)

apt-cache madison creeper sudo apt install creeper=<VERSION_BEFORE_1.1.3> sudo apt-mark hold creeper

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list creeper sudo dnf downgrade creeper-<VERSION_BEFORE_1.1.3> sudo dnf versionlock add creeper

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-2020-26292?

creeper: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-26292 being exploited?

CVE-2020-26292 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-2020-26292 affect?

CVE-2020-26292 affects creeper. Severity is low (CVSS 3.1). Creeper is an experimental dynamic, interpreted language. The binary release of Creeper Interpreter 1.1.3 contains potential malware. The compromised binary release was available for a few hours between December 26, 2020 at 3:22 PM EST to D

How urgent is CVE-2020-26292?

Priority 26/100. No elevated risk signals yet.

References

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