Medium severity · published Sep 28, 2026
CVE-2026-94285
Out-of-bounds read in libX11's byte-oriented codeset parser
5.1
CVSS
0.1%
EPSS
No
On KEV
Description
An out-of-bounds read in libX11's byte-oriented codeset parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libX11 · x.org
before 1.8.14 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-94285
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-94285
patch
https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=980868483446f24f9658d26aa5bfa42f3da6dd3a
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