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PatchSiren cyber security CVE debrief

CVE-2026-50262 Red Hat CVE debrief

CVE-2026-50262 is a medium-severity vulnerability in the X.Org X server and Xwayland. An out-of-bounds read flaw was found in __glXDisp_ChangeDrawableAttributes, allowing a client-controlled number of bytes to be read, exceeding the request buffer, and leading to information disclosure. A write path also exists but requires byte-swapped clients, which is disabled by default. The vulnerability has a CVSS score of 5.5 and was published on 2026-06-05T12:16:39.770Z.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-07-27
Advisory published
2026-06-05
Advisory updated
2026-07-27

Who should care

Users of X.Org X server and Xwayland should apply patches to mitigate this vulnerability.

Technical summary

The vulnerability is caused by a wrong size validation check in __glXDisp_ChangeDrawableAttributes, allowing an out-of-bounds read. This can lead to information disclosure.

Defensive priority

medium

Recommended defensive actions

  • Apply patches from vendors like Red Hat
  • Review and update X.Org X server and Xwayland installations

Evidence notes

Vendor and product information is still being gathered. Red Hat is likely affected.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50262 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50262

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50262 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50262

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.