CVE-2026-88384

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-09-24. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

OpenEXR 3.4.14 contains a NULL Pointer Dereference in the C++ attribute parsing path. A specially crafted EXR file containing an unknown-type attribute with dataSize set to zero causes the parser to create an opaque attribute with a NULL packed_data pointer. The OpaqueAttribute constructor passes the NULL pointer to memcpy() without validating the zero-size condition, resulting in undefined behavior and process termination, leading to denial of service.

CVSS v3
5.5
EG Score
5.5MEDIUMhigh confidence
EG Risk
29
EG Risk 29/100CISA 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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 24, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Sep 24, 2026
Patch available. Sources: github_pr.
generic

[Bug]NULL pointer passed to memcpy when parsing an unknown-type (opaque) attribute with dataSize=0, triggering UBSan trap (CWE-476) · Issue #2612 · AcademySoftwareFoundation/openexr · GitHub

https://github.com/AcademySoftwareFoundation/openexr/issues/2612
github_pr Patch Available

check for dataSize==0 before memcpy in OpaqueAttribute

Patch available: AcademySoftwareFoundation/openexr v3.5.0 (PR #2615 merged 2026-09-01)

https://github.com/AcademySoftwareFoundation/openexr/pull/2615/changes/70ddecfe82d2566f3776b8ed923939afd47baca2
github_pr Patch Available

check for dataSize==0 before memcpy in OpaqueAttribute

Patch available: AcademySoftwareFoundation/openexr v3.5.0 (PR #2615 merged 2026-09-01)

https://github.com/AcademySoftwareFoundation/openexr/pull/2615

Vendor Advisories for CVE-2026-88384(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 31× 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. 2026-10-04 00:33 UTCEG score recompute
  2. 2026-10-04 00:33 UTCGHSA enrichment
  3. 2026-10-03 02:39 UTCEG score recompute
  4. 2026-10-03 02:39 UTCGHSA enrichment
  5. 2026-10-02 04:44 UTCEG score recompute
  6. 2026-10-02 04:44 UTCGHSA enrichment
  7. 2026-10-01 19:51 UTCEPSS rescore
  8. 2026-10-01 06:49 UTCEG score recompute
  9. 2026-10-01 06:49 UTCGHSA enrichment
  10. 2026-09-30 15:04 UTCEPSS rescore
  11. 2026-09-30 08:53 UTCEG score recompute
  12. 2026-09-30 08:52 UTCGHSA enrichment
  13. 2026-09-29 10:58 UTCEG score recompute
  14. 2026-09-29 10:58 UTCGHSA enrichment
  15. 2026-09-28 13:52 UTCEPSS rescore
  16. 2026-09-28 13:03 UTCGHSA enrichment
  17. 2026-09-27 15:08 UTCEG score recompute
  18. 2026-09-27 15:08 UTCGHSA enrichment
  19. 2026-09-27 13:48 UTCEPSS rescore
  20. 2026-09-26 17:12 UTCEG score recompute
  21. 2026-09-26 17:12 UTCGHSA enrichment
  22. 2026-09-26 15:59 UTCEPSS rescore
  23. 2026-09-25 19:14 UTCEG score recompute
  24. 2026-09-25 19:14 UTCGHSA enrichment
  25. 2026-09-24 21:16 UTCGHSA enrichment
Show 6 more
  1. 2026-09-24 19:35 UTCEG score recompute▲ 5.50
  2. 2026-09-24 19:35 UTCGHSA enrichment
  3. 2026-09-24 19:34 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  4. 2026-09-24 17:33 UTCNVD update
  5. 2026-09-24 16:31 UTCEG score recompute
  6. 2026-09-24 16:26 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88384?
CVE-2026-88384 is a medium vulnerability published on September 24, 2026. OpenEXR 3.4.14 contains a NULL Pointer Dereference in the C++ attribute parsing path. A specially crafted EXR file containing an unknown-type attribute with dataSize set to zero causes the parser to create an opaque attribute with a NULL packed_data pointer. The OpaqueAttribute constructor passes…
When was CVE-2026-88384 disclosed?
CVE-2026-88384 was first published on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88384 actively exploited?
CVE-2026-88384 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88384?
CVE-2026-88384 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88384?
A fix for CVE-2026-88384 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-88384 are linked in the Vendor Advisories panel on this page.

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