What is CVE-2023-29132?

CVE-2023-29132 is a medium-severity vulnerability in Irssi, classified under Use After Free. CVSS score: 5.3/10. Published 2023-04-14.

How severe is CVE-2023-29132?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Use After Free in Irssi

CVE-2023-29132

Irssi 1.3.x and 1.4.x before 1.4.4 has a use-after-free because of use of a stale special collector reference. This occurs when printing of a non-formatted line is concurrent with printing of a formatted line.

Vulnerability class: Use-After-Free

Published 2023-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.008 (55.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Irssi

Weakness classification (CWE)

CWE-416 — Use After Free

References

irssi.org/security/irssi_sa_2023_03.txt (Third Party Advisory)
www.openwall.com/lists/oss-security/2023/03/30/5 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2023-29132?: CVE-2023-29132 is a medium-severity vulnerability in Irssi, classified under Use After Free. CVSS score: 5.3/10. Published 2023-04-14.
How severe is CVE-2023-29132?: Medium severity. CVSS v3 base score is 5.3 out of 10.