Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2021-3537
n/a libxml2 — A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causin…
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H N N U N N H 5.9 .0360 89.3 —
AFFECTED
Product Versions Fixed
libxml2 libxml2 2.9.11 – —
TIMELINE
May 5 Reserved by redhat
May 14 Published (CNA: redhat)
Oct 14 ENRICHED — CVE-2021-3537 (libxml2). Received CVSS 5.9 and CPE data from NVD.
Description
A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 5, 2021 | Reserved | Reserved by redhat |
| May 14, 2021 | Published | Published (CNA: redhat) |
| October 14, 2026 | ENRICHED | ENRICHED — CVE-2021-3537 (libxml2). Received CVSS 5.9 and CPE data from NVD. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| n/a | libxml2 | — | libxml2 2.9.11 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-3537 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 Monday, October 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.
