CVE-2026-96280

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — Patch released this week

Also known asEUVD-2026-88015 (ENISA EUVD)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • 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 34/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 27, 2026

Last Modified

November 2, 2026

Advisory Details (3)

Auto-updated Sep 27, 2026
Patch available. Sources: redhat, github.
GitHub advisoryMentions a patch (unverified)

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
Red Hat

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
Red HatMentions a patch (unverified)

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

Vendor Advisories for CVE-2026-96280(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatflatpak-0:1.12.7-5.el9_2.52026-10-29redhat
redhatflatpak-0:1.12.9-4.el9_6.52026-10-26redhat
redhatflatpak-0:1.12.9-3.el9_4.52026-10-26redhat
redhatflatpak-0:1.12.9-7.el8_102026-10-12redhat
redhatflatpak-0:1.16.0-9.el10_2.42026-10-12redhat
redhatflatpak-0:1.12.9-4.el9_8.42026-10-12redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

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 19× in last 7d / 68× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 84 is merged into the row it repeats.

  1. 2026-11-02 13:27 UTCEG score recompute
  2. 2026-11-02 13:27 UTCVendor advisory
  3. 2026-11-02 12:42 UTCEG score recompute
  4. 2026-11-02 12:42 UTCVendor advisory
  5. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  7. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-10-29 22:26 UTCEG score recompute
  9. 2026-10-29 22:26 UTCVendor advisory
  10. 2026-10-29 22:16 UTCEG score recompute
  11. 2026-10-29 22:16 UTCVendor advisory
  12. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-27 05:28 UTCEG score recompute
  16. 2026-10-27 05:28 UTCVendor advisory
  17. 2026-10-27 04:21 UTCEG score recompute
  18. 2026-10-27 04:21 UTCVendor advisory
  19. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  20. 2026-10-26 03:27 UTCEG score recompute
  21. 2026-10-26 03:27 UTCVendor advisory
  22. 2026-10-26 02:36 UTCEG score recompute
  23. 2026-10-26 02:36 UTCVendor advisory
  24. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  25. 2026-10-25 13:48 UTCEG score recompute
Show 58 more
  1. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  4. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  6. 2026-10-20 08:01 UTCEG score recompute
  7. 2026-10-20 08:01 UTCVendor advisory
  8. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  9. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  10. 2026-10-18 02:57 UTCEG score recompute
  11. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  12. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  13. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  14. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  15. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  16. 2026-10-12 17:27 UTCEG score recompute
  17. 2026-10-12 16:41 UTCEG score recompute
  18. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  19. 2026-10-12 14:40 UTCEG score recompute
  20. 2026-10-12 08:26 UTCEG score recompute
  21. 2026-10-12 08:08 UTCEG score recompute
  22. 2026-10-12 04:29 UTCEG score recompute
  23. 2026-10-12 03:45 UTCEG score recompute
  24. 2026-10-11 19:11 UTCEG score recompute
  25. 2026-10-11 16:27 UTCEG score recompute
  26. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  27. 2026-10-11 13:39 UTCEG score recompute
  28. 2026-10-11 06:47 UTCEG score recompute
  29. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  30. 2026-10-09 20:45 UTCEG score recompute
  31. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  32. 2026-10-08 22:06 UTCEG score recompute
  33. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  34. 2026-10-08 10:45 UTCEG score recompute
  35. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  36. 2026-10-07 00:22 UTCEG score recompute
  37. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  38. 2026-10-06 01:41 UTCEG score recompute
  39. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  40. 2026-10-05 03:01 UTCEG score recompute
  41. 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  42. 2026-10-03 16:56 UTCEG score recompute
  43. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  44. 2026-10-02 18:16 UTCEG score recompute
  45. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  46. 2026-10-02 06:53 UTCEG score recompute
  47. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  48. 2026-09-30 20:54 UTCEG score recompute
  49. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  50. 2026-09-29 16:44 UTCEG score recompute
  51. 2026-09-29 15:58 UTCEG score recompute
  52. 2026-09-29 07:27 UTCEG score recompute
  53. 2026-09-28 20:07 UTCEG score recompute
  54. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  55. 2026-09-27 21:25 UTCEG score recomputeFirst assessed: 7.5 HIGH
  56. 2026-09-27 21:25 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  57. 2026-09-27 20:30 UTCEG score recompute
  58. 2026-09-27 20:30 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-96280?
CVE-2026-96280 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-96280 was made public on August 11, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on September 27, 2026. EchelonGraph's copy of the record carries a last-modified date of November 2, 2026; the record at its source may have been updated since.
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 (47th 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. The vendor advisories EchelonGraph has for CVE-2026-96280 are linked in the Vendor Advisories panel on this page.

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