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

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.61% · top 50% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:1.16.0-9.el10_2.4 – < *

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:1.18.0-2.el10_3.4 – < *

• Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support

  • unaffected 0:1.16.0-5.el10_0.6 – < *

• Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support

  • unaffected 0:1.12.9-6.el7_9 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:1.12.9-7.el8_10 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

  • unaffected 0:1.12.9-2.el8_4.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

  • unaffected 0:1.12.9-2.el8_4.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

  • unaffected 0:1.12.9-1.el8_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

  • unaffected 0:1.12.9-1.el8_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service

  • unaffected 0:1.12.9-1.el8_8.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

  • unaffected 0:1.12.9-1.el8_8.1 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:1.12.9-4.el9_8.4 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:1.12.9-6.el9_9.5 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:1.12.7-5.el9_2.5 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

  • unaffected 0:1.12.9-3.el9_4.5 – < *

• Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support

  • unaffected 0:1.12.9-4.el9_6.5 – < *

What to do

Workaround: Only install applications from trusted OCI registries. Flatpak remotes using the default OSTree transport are not affected.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-88015 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-96280](https://cveledger.app/badge/CVE-2026-96280.svg)](https://cveledger.app/cve/CVE-2026-96280)

Record last updated 11 Nov 2026, 19:13 UTC.