Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2026-34000 medium CVSS 6.1

Out-of-Bounds Read in X.Org X server (CVE-2026-34000)

Summary

Vulnerability in X.Org X server (CVE-2026-34000). Confidential information can be exposed externally. Exploitable via XkbAddGeomKeyAlias.

Original description

The description as published by the source.

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the CheckSetGeom() and XkbAddGeomKeyAlias functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-34000 has been found in X.Org X server.
Attackers can target a specific entry point like XkbAddGeomKeyAlias over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "X.Org X server CVE-2026-34000" on the vendor's site.

CVE-2026-34000 (X.Org X server) — CWE-125 / CVSS v3 6.1
Attack vector: local / no user interaction
Attack surface: XkbAddGeomKeyAlias
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Out-of-bounds read (CWE-125) exists in X.Org X server. Attackers reach the vulnerable code path via XkbAddGeomKeyAlias.

📍 Affected scope

Check the vendor advisory for the affected versions of X.Org X server. Attack surface: XkbAddGeomKeyAlias.

🔥 Severity

Severity: Medium (CVSS 6.1/10). Confidential information can be exposed externally.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで X.Org X server を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details