CVE-2023-30858: The Denosaurs emoji package provides emojis for dinosaurs

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2023-30858 is a medium-severity flaw (CVSS 5.3) affecting emoji. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Denosaurs emoji package provides emojis for dinosaurs. Starting in version 0.1.0 and prior to version 0.3.0, the reTrimSpace regex has 2nd degree polynomial inefficiency, leading to a delayed response given a big payload. The issue has been patched in 0.3.0. As a workaround, avoid using the `replace`, `unemojify`, or `strip` functions.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 33%)
CISA exploited list	No
Weakness	CWE-1333
Published	2023-04-28
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: denosaurs

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

Am I affected?

Timeline

2023-04-28 21:15 UTCPublished CVE record published
2026-06-17 05:55 UTCUpdated Record last modified

denosaurs emoji UPGRADE

Affected: >= 0.1.0 and < 0.3.0

Fixed in: 0.3.0

Safe to downgrade to: a release before 0.1.0

1. Check installed version

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

2. UPGRADE to 0.3.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade emoji

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 0.1.0 (Debian / Ubuntu)

apt-cache madison emoji sudo apt install emoji=<VERSION_BEFORE_0.1.0> sudo apt-mark hold emoji

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

dnf --showduplicates list emoji sudo dnf downgrade emoji-<VERSION_BEFORE_0.1.0> sudo dnf versionlock add emoji

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-2023-30858?

emoji: upgrade to 0.3.0. Exact commands for each OS are on this page.

Is CVE-2023-30858 being exploited?

CVE-2023-30858 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-2023-30858 affect?

CVE-2023-30858 affects emoji. Severity is medium (CVSS 5.3). The Denosaurs emoji package provides emojis for dinosaurs. Starting in version 0.1.0 and prior to version 0.3.0, the reTrimSpace regex has 2nd degree polynomial inefficiency, leading to a delayed response given a big payload. The issue has

How urgent is CVE-2023-30858?

Priority 45/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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