CVE-2026-77658Public exploit

Application crash via unbounded stack allocation

Published Aug 26, 2026 · Updated Aug 26, 2026

Stack-based buffer overflow in GNOME Dia 0.98.0 and earlier allows attackers to crash the application through a crafted .dia file. In bus_handle_moved(), an unchecked bus_handles value controls the size of two g_alloca() stack arrays, exhausting the thread stack. The victim must open the file and move a Bus handle; confirmed impact is a SIGSEGV crash, while code execution remains potential.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in GNOME Dia 0.98.0 and earlier allows attackers to crash the application through a crafted .dia file. In bus_handle_moved(), an unchecked bus_handles value controls the size of two g_alloca() stack arrays, exhausting the thread stack. The victim must open the file and move a Bus handle; confirmed impact is a SIGSEGV crash, while code execution remains potential.

The record

CVE
CVE-2026-77658
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
XMLSoft
Product
Dia
Classifications
CWE-121, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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 <=0.98.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

XMLSoft · Diaversion=0 <=0.98.0

Published CVSS scores

7.8Fedora CNACVSS: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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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