CVE-2026-96280Network attack vector

Code execution via truncated OCI delta sizes

Published Sep 27, 2026 · Updated Sep 27, 2026

Heap buffer overflow in Flatpak 1.18.0 and earlier allows remote attackers controlling an OCI registry to execute code on 32-bit clients during installs. The OCI delta stream parser passes 64-bit sizes to GLib routines expecting 32-bit gsize values, allocating undersized buffers before using the original lengths. Exploitation requires an attacker-controlled OCI remote and a user-initiated install or update; the size truncation does not affect 64-bit builds.

CVSS severity7.5
High
EPSS probability0.66%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Flatpak 1.18.0 and earlier allows remote attackers controlling an OCI registry to execute code on 32-bit clients during installs. The OCI delta stream parser passes 64-bit sizes to GLib routines expecting 32-bit gsize values, allocating undersized buffers before using the original lengths. Exploitation requires an attacker-controlled OCI remote and a user-initiated install or update; the size truncation does not affect 64-bit builds.

The record

CVE
CVE-2026-96280
Published
Sep 27, 2026
Updated
Sep 27, 2026
Vendor
Commonhaus Foundation
Product
Red Hat Enterprise Linux 10
Classifications
T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Commonhaus Foundation · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
Commonhaus Foundation · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
Commonhaus Foundation · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
Commonhaus Foundation · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

7.5Amazon LinuxCVSS:3.1/AV:N/AC:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204User Execution

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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