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CVE-2026-88807

libXrender RenderQueryPictFormats Reply Heap-based Buffer Overflow

HIGH
8.9
CVSS Score
Published: September 21, 2026 at 01:49 PM UTC
Updated: September 22, 2026 at 07:51 PM UTC
1 product affected across 1 vendorLibxrender

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Severity
HIGH8.9
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

A heap overflow in libXrender before 0.9.13 in RenderQueryPictFormats could be used by malicious X servers to inject code into attached X clients.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libxrender· X Org
95%
v < 0.9.13
Affected range stops below 0.9.13, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Patch
Source: cverecord
https://gitlab.freedesktop.org/xorg/lib/libxrender/-/merge_requests/19

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.9HIGHsuse
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-122

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