CVE-2026-77652

Process crash via unchecked WPG palette bounds

Published Aug 26, 2026 · Updated Aug 27, 2026

Heap-based buffer overflow in GNOME Dia 0.98+git20260221-1 allows attackers to crash the process by inducing a user to open a crafted WPG file. The WPG_COLORMAP handler passes an untrusted start index and color count to fread without ensuring that the write remains within its fixed 256-entry heap palette. User interaction is required; a crash is demonstrated, while code execution depends on usable heap-layout primitives and has not been demonstrated.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in GNOME Dia 0.98+git20260221-1 allows attackers to crash the process by inducing a user to open a crafted WPG file. The WPG_COLORMAP handler passes an untrusted start index and color count to fread without ensuring that the write remains within its fixed 256-entry heap palette. User interaction is required; a crash is demonstrated, while code execution depends on usable heap-layout primitives and has not been demonstrated.

The record

CVE
CVE-2026-77652
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
XMLSoft
Product
Dia
Classifications
CWE-122, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.98+git20260221-1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

XMLSoft · Diaversion=0 <=0.98+git20260221-1

Published CVSS scores

7.8SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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