Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
n/a n/a — OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the…
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U H H H 9.8 .0042 35.3 —
AFFECTED
Product Versions Fixed
n/a n/a – —
TIMELINE
Jun 8 Reserved by mitre
Jul 13 EXPLOIT PUBLISHED — CVE-2026-51540. Public exploit reference added.
Jul 13 Published (CNA: mitre)
Description
OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory corruption issue caused by an integer underflow in the processing of connected explicit messages (SendUnitData).
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| June 8, 2026 | Reserved | Reserved by mitre |
| July 13, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-51540. Public exploit reference added. |
| July 13, 2026 | Published | Published (CNA: mitre) |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| n/a | n/a | — | n/a | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-51540 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.