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TI-2026-63748 Aliases CVE-2026-96280

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

Priority LOW 36CWE-197Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00586 48th percentileScored 2026-11-07
Fix Partial Red Hat: 8 advisoriesRed Hat: 14 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 10—1.16.0-9.el10_2.4Patch availableCNA
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support—1.16.0-5.el10_0.6Patch availableCNA
Red HatRed Hat Enterprise Linux 8—1.12.9-7.el8_10Patch availableCNA
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support—1.12.9-1.el8_6.1Patch availableCNA
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On—1.12.9-1.el8_6.1Patch availableCNA
Red HatRed Hat Enterprise Linux 9—1.12.9-4.el9_8.4Patch availableCNA
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions—1.12.7-5.el9_2.5Patch availableCNA
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions—1.12.9-3.el9_4.5Patch availableCNA
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support—1.12.9-4.el9_6.5Patch availableCNA
Red HatRed Hat Enterprise Linux 7——No fix listedCNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 1.16.0-9.el10_2.4 Patch available CNA
  • Red Hat Enterprise Linux 10.0 Extended Update Support VendorRed Hat Affected — Fixed in 1.16.0-5.el10_0.6 Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 1.12.9-7.el8_10 Patch available CNA
  • Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 1.12.9-1.el8_6.1 Patch available CNA
  • Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On VendorRed Hat Affected — Fixed in 1.12.9-1.el8_6.1 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 1.12.9-4.el9_8.4 Patch available CNA
  • Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 1.12.7-5.el9_2.5 Patch available CNA
  • Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 1.12.9-3.el9_4.5 Patch available CNA
  • Red Hat Enterprise Linux 9.6 Extended Update Support VendorRed Hat Affected — Fixed in 1.12.9-4.el9_6.5 Patch available CNA
  • Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 13

CPEVersionsRoleVendor
cpe:/o:redhat:enterprise_linux:10.210.2—Red Hat
cpe:/o:redhat:enterprise_linux_eus:10.010.0—Red Hat
cpe:/a:redhat:enterprise_linux:8::appstream8—Red Hat
cpe:/a:redhat:enterprise_linux:8::crb8—Red Hat
cpe:/a:redhat:rhel_aus:8.6::appstream8.6—Red Hat
cpe:/a:redhat:rhel_eus_long_life:8.6::appstream8.6—Red Hat
cpe:/a:redhat:enterprise_linux:9::appstream9—Red Hat
cpe:/a:redhat:enterprise_linux:9::crb9—Red Hat
cpe:/a:redhat:rhel_e4s:9.2::appstream9.2—Red Hat
cpe:/a:redhat:rhel_e4s:9.4::appstream9.4—Red Hat
  • cpe:/o:redhat:enterprise_linux:10.2 Versions 10.2 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux_eus:10.0 Versions 10.0 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:8::appstream Versions 8 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:8::crb Versions 8 — ·Red Hat
  • cpe:/a:redhat:rhel_aus:8.6::appstream Versions 8.6 — ·Red Hat
  • cpe:/a:redhat:rhel_eus_long_life:8.6::appstream Versions 8.6 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:9::appstream Versions 9 — ·Red Hat
  • cpe:/a:redhat:enterprise_linux:9::crb Versions 9 — ·Red Hat
  • cpe:/a:redhat:rhel_e4s:9.2::appstream Versions 9.2 — ·Red Hat
  • cpe:/a:redhat:rhel_e4s:9.4::appstream Versions 9.4 — ·Red Hat
Show 3 more CPE
CPEVersionsRoleVendor
cpe:/a:redhat:rhel_eus:9.6::appstream9.6—Red Hat
cpe:/a:redhat:rhel_eus:9.6::crb9.6—Red Hat
cpe:/o:redhat:rhel_els:77—Red Hat
  • cpe:/a:redhat:rhel_eus:9.6::appstream Versions 9.6 — ·Red Hat
  • cpe:/a:redhat:rhel_eus:9.6::crb Versions 9.6 — ·Red Hat
  • cpe:/o:redhat:rhel_els:7 Versions 7 — ·Red Hat

Remediation

Red Hat 8 advisories

  • RHSA-2026:95493 Released 2026-11-05 · Red Hat rating Important
    flatpak security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) flatpak-1.12.9-1.el8_6.1, flatpak-libs-1.12.9-1.el8_6.1, flatpak-selinux-1.12.9-1.el8_6.1 +1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) flatpak-1.12.9-1.el8_6.1, flatpak-libs-1.12.9-1.el8_6.1, flatpak-selinux-1.12.9-1.el8_6.1 +1
  • RHSA-2026:92221 Released 2026-11-02 · Red Hat rating Important
    flatpak security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) flatpak-1.16.0-5.el10_0.6, flatpak-libs-1.16.0-5.el10_0.6, flatpak-selinux-1.16.0-5.el10_0.6 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) flatpak-devel-1.16.0-5.el10_0.6
  • RHSA-2026:92369 Released 2026-10-29 · Red Hat rating Important
    flatpak security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) flatpak-1.12.7-5.el9_2.5, flatpak-libs-1.12.7-5.el9_2.5, flatpak-selinux-1.12.7-5.el9_2.5 +1
Show 5 more Red Hat advisories
  • RHSA-2026:90364 Released 2026-10-26 · Red Hat rating Important
    flatpak security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) flatpak-1.12.9-3.el9_4.5, flatpak-libs-1.12.9-3.el9_4.5, flatpak-selinux-1.12.9-3.el9_4.5 +1
  • RHSA-2026:89733 Released 2026-10-26 · Red Hat rating Important
    flatpak security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) flatpak-1.12.9-4.el9_6.5, flatpak-devel-1.12.9-4.el9_6.5, flatpak-session-helper-1.12.9-4.el9_6.5
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) flatpak-1.12.9-4.el9_6.5, flatpak-libs-1.12.9-4.el9_6.5, flatpak-selinux-1.12.9-4.el9_6.5 +1
  • RHSA-2026:80687 Released 2026-10-12 · Red Hat rating Important
    flatpak security update
    • Red Hat Enterprise Linux AppStream (v. 8) flatpak-1.12.9-7.el8_10, flatpak-libs-1.12.9-7.el8_10, flatpak-selinux-1.12.9-7.el8_10 +1
    • Red Hat Enterprise Linux CRB (v. 8) flatpak-1.12.9-7.el8_10, flatpak-devel-1.12.9-7.el8_10, flatpak-session-helper-1.12.9-7.el8_10
  • RHSA-2026:80497 Released 2026-10-12 · Red Hat rating Important
    flatpak security update
    • Red Hat Enterprise Linux AppStream (v. 9) flatpak-1.12.9-4.el9_8.4, flatpak-libs-1.12.9-4.el9_8.4, flatpak-selinux-1.12.9-4.el9_8.4 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) flatpak-1.12.9-4.el9_8.4, flatpak-devel-1.12.9-4.el9_8.4, flatpak-session-helper-1.12.9-4.el9_8.4
  • RHSA-2026:80498 Released 2026-10-12 · Red Hat rating Important
    flatpak security update
    • Red Hat Enterprise Linux AppStream (v. 10) flatpak-1.16.0-9.el10_2.4, flatpak-libs-1.16.0-9.el10_2.4, flatpak-selinux-1.16.0-9.el10_2.4 +1
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) flatpak-devel-1.16.0-9.el10_2.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:80497

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:80498

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →
Show 6 more groups
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:80687

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:89733

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:90364

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:92221

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:92369

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →
  • Advisory ·

    Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 8 more products — RHSA-2026:95493

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-63745 Flatpak: flatpak: arbitrary write access as root via extra-data extractionPriority MEDIUM 41
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:89733
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:80498
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:80687
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:80497
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:95493
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:92369
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:90364
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:92221
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:89733
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:95493
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:80687
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:80498
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:80497
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:92221

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-96280
  2. 2026-10-12 Fix available: flatpak@0:1.16.0-9.el10_2.4 · CNA
  3. 2026-10-12 1 new reference · CNA
  4. 2026-10-12 Fix available: RHSA-2026:80498 · Red Hat
  5. 2026-10-12 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat
  6. 2026-10-12 Fix available: flatpak@0:1.12.9-4.el9_8.4 · CNA
  7. 2026-10-12 1 new reference · CNA
  8. 2026-10-12 Fix available: RHSA-2026:80497 · Red Hat
  9. 2026-10-12 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · Red Hat
  10. 2026-10-12 Fix available: flatpak@0:1.12.9-7.el8_10 · CNA
  11. 2026-10-12 1 new reference · CNA
  12. 2026-10-12 Fix available: RHSA-2026:80687 · Red Hat
  13. 2026-10-13 EPSS moved to the 50th–90th percentile
  14. 2026-10-13 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat
  15. 2026-10-25 EPSS moved to the below the 50th percentile
  16. 2026-10-26 Fix available: flatpak@0:1.12.9-4.el9_6.5 · CNA
  17. 2026-10-26 1 new reference · CNA
  18. 2026-10-26 Fix available: RHSA-2026:89733 · Red Hat
  19. 2026-10-26 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6) · Red Hat
  20. 2026-10-27 Fix available: flatpak@0:1.12.9-3.el9_4.5 · CNA
  21. 2026-10-27 1 new reference · CNA
  22. 2026-10-27 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.4) · Red Hat
  23. 2026-10-29 Fix available: RHSA-2026:90364 · Red Hat
  24. 2026-10-29 Fix available: flatpak@0:1.12.7-5.el9_2.5 · CNA
  25. 2026-10-29 1 new reference · CNA
  26. 2026-10-30 Fix available: RHSA-2026:92369 · Red Hat
  27. 2026-10-30 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2) · Red Hat
  28. 2026-11-02 Fix available: RHSA-2026:92221 · Red Hat
  29. 2026-11-02 Fix available: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · Red Hat
  30. 2026-11-02 Fix available: flatpak@0:1.16.0-5.el10_0.6 · CNA
  31. 2026-11-02 1 new reference · CNA
  32. 2026-11-06 Fix available: flatpak@0:1.12.9-1.el8_6.1 · CNA
  33. 2026-11-06 1 new reference · CNA
  34. 2026-11-06 Fix available: RHSA-2026:95493 · Red Hat
  35. 2026-11-06 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · Red Hat

References

Advisory 8

Other 3

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences