CVE-2022-4891: A vulnerability has been found in Sisimai up to 4.25.14p11 and classified as problematic

Q: How do I fix CVE-2022-4891?

sisimai: upgrade to 4.25.14. Exact commands for each OS are on this page.

Q: Is CVE-2022-4891 being exploited?

CVE-2022-4891 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-2022-4891 affect?

CVE-2022-4891 affects sisimai. Severity is low (CVSS 3.5). A vulnerability has been found in Sisimai up to 4.25.14p11 and classified as problematic. This vulnerability affects the function to_plain of the file lib/sisimai/string.rb. The manipulation leads to inefficient regular expression complexit

Q: How urgent is CVE-2022-4891?

Priority 35/100. Public exploit reference

Routine

LOW 3.5UPGRADE

CVE-2022-4891 is a low-severity flaw (CVSS 3.5) affecting sisimai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in Sisimai up to 4.25.14p11 and classified as problematic. This vulnerability affects the function to_plain of the file lib/sisimai/string.rb. The manipulation leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. Upgrading to version 4.25.14p12 is able to address this issue. The name of the patch is 51fe2e6521c9c02b421b383943dc9e4bbbe65d4e. It is recommend

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-1333
Published	2023-01-17
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: libsisimai

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

Am I affected?

Timeline

2023-01-17 20:15 UTCPublished CVE record published
2026-06-17 05:22 UTCUpdated Record last modified

libsisimai sisimai UPGRADE

Affected: < 4.25.14 · 4.25.14 · 4.25.14 p1 · 4.25.14 p10 · 4.25.14 p11 · 4.25.14 p3 · 4.25.14 p5 · 4.25.14 p6

Fixed in: 4.25.14

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.25.14 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sisimai

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-2022-4891?

sisimai: upgrade to 4.25.14. Exact commands for each OS are on this page.

Is CVE-2022-4891 being exploited?

CVE-2022-4891 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-2022-4891 affect?

CVE-2022-4891 affects sisimai. Severity is low (CVSS 3.5). A vulnerability has been found in Sisimai up to 4.25.14p11 and classified as problematic. This vulnerability affects the function to_plain of the file lib/sisimai/string.rb. The manipulation leads to inefficient regular expression complexit

How urgent is CVE-2022-4891?

Priority 35/100. Public exploit reference

References

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