CVE-2026-96280

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (46th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 27, 2026

Last Modified

September 29, 2026

Advisory Details (3)

Auto-updated Sep 27, 2026
Patch available. Sources: redhat, github.
github Patch Available

CVE-2026-96280: Buffer overflow in OCI delta stream path names · Advisory · flatpak/flatpak · GitHub

Affected: version 1.18.1 by commits:

https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc
redhat

2539419 – (CVE-2026-96280) CVE-2026-96280 flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems

https://bugzilla.redhat.com/show_bug.cgi?id=2539419
redhat Patch Available

CVE-2026-96280 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-96280

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
flatpak1.14.10-1 ... 1.18.4-1 (53 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
flatpak1.16.1-1 ... 1.16.6-1~deb13u1~bpo12+1 (12 versions)
  • every version up to 1.16.6-1~deb13u2: fixed in 1.16.6-1~deb13u2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
flatpak1.16.1-1 ... 1.18.0-1 (20 versions)
  • every version up to 1.18.1-1: fixed in 1.18.1-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 03:01 UTCEG score recompute
  2. 2026-10-04 23:23 UTCEPSS rescore
  3. 2026-10-03 16:56 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 18:16 UTCEG score recompute
  6. 2026-10-02 17:57 UTCEPSS rescore
  7. 2026-10-02 06:53 UTCEG score recompute
  8. 2026-10-01 19:51 UTCEPSS rescore
  9. 2026-09-30 20:54 UTCEG score recompute
  10. 2026-09-30 15:04 UTCEPSS rescore
  11. 2026-09-29 16:44 UTCEG score recompute
  12. 2026-09-29 15:58 UTCEG score recompute
  13. 2026-09-29 07:27 UTCEG score recompute
  14. 2026-09-28 20:07 UTCEG score recompute
  15. 2026-09-28 13:52 UTCEPSS rescore
  16. 2026-09-28 13:52 UTCEPSS rescore
  17. 2026-09-27 21:25 UTCEG score recompute▲ 7.50
  18. 2026-09-27 21:25 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  19. 2026-09-27 20:30 UTCEG score recompute
  20. 2026-09-27 20:30 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-96280?
CVE-2026-96280 is a high vulnerability published on September 27, 2026. 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…
When was CVE-2026-96280 disclosed?
CVE-2026-96280 was first published on September 27, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-96280 actively exploited?
CVE-2026-96280 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-96280?
CVE-2026-96280 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-96280?
A fix for CVE-2026-96280 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-96280

Explore →

Is Your Infrastructure Affected by CVE-2026-96280?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs