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-2016-9840

CVE-2016-9840HIGH

n/a n/a — inftrees.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  H  H  H    8.8   .0488   91.9     —

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

TIMELINE
  Dec 5   Reserved by microfocus
  May 23  Published (CNA: microfocus)
  Oct 8   ENRICHED — CVE-2016-9840. Received CVSS 8.8 and CPE data from NVD.

CNA: microfocus · CVSS v3.1 · 31 references · NVD status: Modified

Description

inftrees.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 5, 2016	Reserved	Reserved by microfocus
May 23, 2017	Published	Published (CNA: microfocus)
October 8, 2026	ENRICHED	ENRICHED — CVE-2016-9840. 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	n/a	—	n/a	—

References (31)

http://lists.opensuse.org/opensuse-updates/2016-12/msg00127.html [Third Party Advisory]
http://lists.opensuse.org/opensuse-updates/2017-01/msg00050.html [Third Party Advisory]
http://lists.opensuse.org/opensuse-updates/2017-01/msg00053.html [Third Party Advisory]
http://www.openwall.com/lists/oss-security/2016/12/05/21 [Mailing List, Third Party Advisory]
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html [Third Party Advisory]
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html [Third Party Advisory]
http://www.securityfocus.com/bid/95131 [Broken Link]
http://www.securitytracker.com/id/1039427 [Broken Link]
https://access.redhat.com/errata/RHSA-2017:1220 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2017:1221 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2017:1222 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2017:2999 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2017:3046 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2017:3047 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2017:3453 [Third Party Advisory]
https://bugzilla.redhat.com/show_bug.cgi?id=1402345 [Issue Tracking, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-470355.html
https://github.com/madler/zlib/commit/6a043145ca6e9c55184013841a67b2fef87e44c0 [Patch, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2019/03/msg00027.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2020/01/msg00030.html [Mailing List, Third Party Advisory]
https://security.gentoo.org/glsa/201701-56 [Third Party Advisory]
https://security.gentoo.org/glsa/202007-54 [Third Party Advisory]
https://support.apple.com/HT208112 [Third Party Advisory]
https://support.apple.com/HT208113 [Third Party Advisory]
https://support.apple.com/HT208115 [Third Party Advisory]
https://support.apple.com/HT208144 [Third Party Advisory]
https://usn.ubuntu.com/4246-1/ [Third Party Advisory]
https://usn.ubuntu.com/4292-1/ [Third Party Advisory]
https://wiki.mozilla.org/MOSS/Secure_Open_Source/Completed#zlib [Third Party Advisory]
https://wiki.mozilla.org/images/0/09/Zlib-report.pdf [Broken Link]
https://www.oracle.com/security-alerts/cpujul2020.html [Third Party Advisory]

Authoritative record: CVE-2016-9840 at cve.org

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2016-9840 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.