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CVE-2026-96280— Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OCI 增量流解析器将读取的大小作为 处理，但将其传递给期望使用 （在 32 位系统中为 32 位）的 GLib I/O 和内存分配函数，导致分配的内存空间不足，而后续操作却使用原始的 64 位大小，从而引发堆缓冲区溢出。攻击者若能控制 OCI 注册表，便可构造特定的增量流，在 flatpak 安装或更新时触发此漏洞，在 32 位系统上 potentially 实现代码执行。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-96280

Vulnerability Information
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Vulnerability Title
Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems
Source: CVE Program / CVE List V5
Vulnerability Description
The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems), causing undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. An attacker controlling an OCI registry can craft a delta stream that triggers this during flatpak install/update, potentially achieving code execution on 32-bit systems.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数值截断错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-96280

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III. Intelligence Information for CVE-2026-96280

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Other References for CVE-2026-96280 (3)

Same Patch Batch · Red Hat · 2026-09-27 · 6 CVEs total

CVE-2026-96279 6.5 MEDIUM Flatpak: flatpak: path traversal issue in oci archive extraction via hardlinks
CVE-2026-96281 6.2 MEDIUM Flatpak: flatpak: unprivileged active user can bypass anti-downgrade checks for system app
CVE-2026-96283 3.3 LOW Flatpak: flatpak: flatpak-system-helper cross-user cancelpull orphans another user's ongoi
CVE-2026-96282 3.1 LOW Flatpak: flatpak: extension metadata path traversal file existence oracle
CVE-2026-96284 2.5 LOW Flatpak: flatpak: arbitrary read-access to files in the system-helper context via oci syml

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-197

V. Comments for CVE-2026-96280

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