Public vulnerability disclosure

CVE-2023-43785

Libx11: out-of-bounds memory access in _xkbreadkeysyms()

publishedCWE-787

A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.

Technical severity6.5 mediumCVSS 3.1 · CNA: redhat
Published2023-10-10Source updated 2026-11-07
Collected2026-11-072 attributed sources

Fixes and workarounds

No remediation reported in collected sources.

Missing remediation information is not evidence that no patch exists.

Affected products and versions

Affected products, source version ranges and reporting authorities
ProductVersionsAuthority


libX11
https://gitlab.freedesktop.org/xorg/lib/libx11
≥ 0; < 1.8.7 (affected, semver)
Other versions: unaffected
CNA: redhat
Red Hat Enterprise Linux 8
Red Hat
libX11
https://access.redhat.com/downloads/content/package-browser/
≥ 0:1.6.8-8.el8; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 9
Red Hat
libX11
https://access.redhat.com/downloads/content/package-browser/
≥ 0:1.7.0-9.el9; < * (unaffected, rpm)
Other versions: affected
CNA: redhat
Red Hat Enterprise Linux 6
Red Hat
libX11
https://access.redhat.com/downloads/content/package-browser/
Range not reported
Other versions: unknown
CNA: redhat
Red Hat Enterprise Linux 7
Red Hat
libX11
https://access.redhat.com/downloads/content/package-browser/
Range not reported
Other versions: unknown
CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / scoreVectorAuthority
3.1 / 6.5
medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NCNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

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