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-2017-9047

CVE-2017-9047HIGH

n/a n/a — A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0319   87.9     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  May 18  Reserved by mitre
  May 18  Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2017-9047. Received CVSS 7.5 and CPE data from NVD.
  Oct 14  EXPLOIT PUBLISHED — CVE-2017-9047. Public exploit reference added.

CWE-119 · CNA: mitre · CVSS v3.0 · 7 references · NVD status: Modified

Description

A buffer overflow was discovered in libxml2 20904-GITv2.9.4-16-g0741801. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. The variable len is assigned strlen(buf). If the content->type is XML_ELEMENT_CONTENT_ELEMENT, then (i) the content->prefix is appended to buf (if it actually fits) whereupon (ii) content->name is written to the buffer. However, the check for whether the content->name actually fits also uses 'len' rather than the updated buffer length strlen(buf). This allows us to write about "size" many bytes beyond the allocated memory. This vulnerability causes programs that use libxml2, such as PHP, to crash.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 18, 2017	Reserved	Reserved by mitre
May 18, 2017	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2017-9047. Received CVSS 7.5 and CPE data from NVD.
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2017-9047. Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-119

References (7)

http://www.debian.org/security/2017/dsa-3952
http://www.openwall.com/lists/oss-security/2017/05/15/1 [Exploit, Mailing List, Patch, Third Party Advisory]
http://www.securityfocus.com/bid/98599 [Third Party Advisory, VDB Entry]
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://security.gentoo.org/glsa/201711-01

Authoritative record: CVE-2017-9047 at cve.org

Weaknesses: CWE-119

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2017-9047 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.