Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-76956
libexpat project libexpat — In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in b…
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0029 19.3 —
AFFECTED
Product Versions Fixed
libexpat 2.8.2 – —
TIMELINE
Aug 20 Reserved by mitre
Aug 20 Published (CNA: mitre)
Sep 8 RESCORED — CVE-2026-76956 (libexpat project libexpat). CVSS 5.9 → 7.5 (NVD).
Description
In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| August 20, 2026 | Reserved | Reserved by mitre |
| August 20, 2026 | Published | Published (CNA: mitre) |
| September 8, 2026 | RESCORED | RESCORED — CVE-2026-76956 (libexpat project libexpat). CVSS 5.9 → 7.5 (NVD). |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| libexpat project | libexpat | — | 2.8.2 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-76956 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 Sunday, October 4, 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.
