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Fencer Vulns
critical 9.8

CVE-2023-40359 json

xterm before 380 supports ReGIS reporting for character-set names even if they have unexpected characters (i.e., neither alphanumeric nor u…

published 2023-08-14 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44930

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

xterm before 380 supports ReGIS reporting for character-set names even if they have unexpected characters (i.e., neither alphanumeric nor underscore), aka a pointer/overflow issue. This can only occur for xterm installations that are configured at compile time to use a certain experimental feature.

Patch / fix

  • invisible-island xterm 380
  • xterm Debian 14, Debian 13 382-2

debian advisories DEBIAN-CVE-2023-40359

  • xterm SLE Module for Basesystem 15 SP5, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.5 +3 more 330-150200.11.12.1

suse advisories SUSE-SU-2023:4438-1

  • xterm openSUSE Tumbleweed 384-2.1

opensuse advisories openSUSE-SU-2024:13240-1

  • xterm CBL-Mariner 2.0 380-1

azure linux advisories AZL-27957

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-40359 updated cvss 3.3

xterm: ReGIS reporting for character-set names containing characters other than alphanumerics or underscore.

  • Red Hat Enterprise Linux 7 xterm
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 xterm, xterm-resize Red Hat Enterprise Linux 9 xterm, xterm-resize
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.