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-2021-3518

CVE-2021-3518HIGH

n/a libxml2 — There's a flaw in libxml2 in versions before 2.9.11.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .2186   97.6     —

AFFECTED
  Product  Versions          Fixed
  libxml2  libxml2 2.9.11 –  —

TIMELINE
  Apr 27  Reserved by redhat
  May 18  Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2021-3518 (libxml2). Received CVSS 8.8 and CPE data from NVD.

CWE-416 · CNA: redhat · CVSS v3.1 · 20 references · NVD status: Modified

Description

There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 27, 2021	Reserved	Reserved by redhat
May 18, 2021	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2021-3518 (libxml2). Received CVSS 8.8 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	—

Weaknesses

CWE-416

References (20)

http://seclists.org/fulldisclosure/2021/Jul/54 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2021/Jul/55 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2021/Jul/58 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2021/Jul/59 [Mailing List, Third Party Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=1954242 [Issue Tracking, Patch, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html [Mailing List, Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/
https://security.gentoo.org/glsa/202107-05 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210625-0002/ [Third Party Advisory]
https://support.apple.com/kb/HT212601 [Third Party Advisory]
https://support.apple.com/kb/HT212602 [Third Party Advisory]
https://support.apple.com/kb/HT212604 [Third Party Advisory]
https://support.apple.com/kb/HT212605 [Third Party Advisory]
https://www.oracle.com/security-alerts/cpuapr2022.html [Patch, Third Party Advisory]
https://www.oracle.com/security-alerts/cpujul2022.html [Not Applicable]
https://www.oracle.com/security-alerts/cpuoct2021.html [Patch, Third Party Advisory]

Authoritative record: CVE-2021-3518 at cve.org

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-3518 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.