CVE-2022-31100: rulex is a new, portable, regular expression language

Q: How do I fix CVE-2022-31100?

pomsky: upgrade to 0.4.3. Exact commands for each OS are on this page.

Q: Is CVE-2022-31100 being exploited?

CVE-2022-31100 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-31100 affect?

CVE-2022-31100 affects pomsky. Severity is medium (CVSS 6.5). rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a str

Q: How urgent is CVE-2022-31100?

Priority 38/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2022-31100 is a medium-severity flaw (CVSS 6.5) affecting pomsky. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a string literal or after a backslash, because rulex tries to slice into the code point and panics as a result. This is a security concern for you, if your service parses untrusted rulex expressions (expressions pro

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	Low
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-617
Published	2022-06-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: pomsky-lang

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

Am I affected?

Timeline

2022-06-27 22:15 UTCPublished CVE record published
2026-06-17 04:44 UTCUpdated Record last modified

pomsky-lang pomsky UPGRADE

Affected: < 0.4.3

Fixed in: 0.4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.4.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pomsky

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2022-31100?

pomsky: upgrade to 0.4.3. Exact commands for each OS are on this page.

Is CVE-2022-31100 being exploited?

CVE-2022-31100 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-2022-31100 affect?

CVE-2022-31100 affects pomsky. Severity is medium (CVSS 6.5). rulex is a new, portable, regular expression language. When parsing untrusted rulex expressions, rulex may crash, possibly enabling a Denial of Service attack. This happens when the expression contains a multi-byte UTF-8 code point in a str

How urgent is CVE-2022-31100?

Priority 38/100. No elevated risk signals yet.

Related CVEs

CVE-2022-31099 MEDIUM 6.5 UPGRADE rulex is a new, portable, regular expression language

References

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