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CVE-2016-9842

33
FAUCET Score

CVE-2016-9842 is a high-severity vulnerability in the zlib library, specifically within the inflateMark function in inflate.c, affecting various products including Apple, Canonical, Debian, Node.js, Oracle, Red Hat, and zlib itself. This flaw, rated 8.8 CVSS, involves left shifts of negative integers, potentially leading to high impact on confidentiality, integrity, and availability. While the vulnerability is significant, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or community discussion, suggesting it has not garnered widespread attention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.2.3.4, < 1.2.9CPE matchmatch criteria
cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
42.2CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.2:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
5.20%
Probability of exploitation in next 30 days
EPSS Percentile
91.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0520 is in the 91st percentile among its peer group of 14,825 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (18)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: azl3 fltk 1.3.8-1 on Azure Linux 3.0Fixed in: 1.3.8-1
microsoftpatch availablevia msrc
Product: 16826-17084Fixed in: 1.3.8-1
microsoftpatch availablevia msrc
Product: 16826-16817Fixed in: 1.3.8-1
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 7Fixed in: java-1.8.0-oracle-1:1.8.0.151-1jpp.5.el7
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 7Fixed in: java-1.7.0-oracle-1:1.7.0.161-1jpp.4.el7
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 7Fixed in: java-1.6.0-sun-1:1.6.0.171-1jpp.4.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: java-1.8.0-ibm-1:1.8.0.4.5-1jpp.1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: java-1.7.1-ibm-1:1.7.1.4.5-1jpp.2.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6 SupplementaryFixed in: java-1.6.0-ibm-1:1.6.0.16.45-1jpp.1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7 SupplementaryFixed in: java-1.8.0-ibm-1:1.8.0.4.5-1jpp.1.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7 SupplementaryFixed in: java-1.7.1-ibm-1:1.7.1.4.5-1jpp.1.el7_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Satellite 5.8Fixed in: java-1.8.0-ibm-1:1.8.0.5.5-1jpp.1.el6_9
View patch
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Satellite 5.8 ELSFixed in: java-1.8.0-ibm-1:1.8.0.5.5-1jpp.1.el6_9
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 6Fixed in: java-1.8.0-oracle-1:1.8.0.151-1jpp.1.el6
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 6Fixed in: java-1.7.0-oracle-1:1.7.0.161-1jpp.3.el6
View patch
redhatpatch availablevia redhat_api
Product: Oracle Java for Red Hat Enterprise Linux 6Fixed in: java-1.6.0-sun-1:1.6.0.171-1jpp.4.el6
View patch

Vendor Advisories (2)

microsoft2017-May/CVE-2016-9842Important

The inflateMark function in inflate.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact

May 9, 2017
redhatCVE-2016-9842Low

zlib: Undefined left shift of negative number

Sep 6, 2016

References

cert-portal.siemens.com / productcert/html/ssa-470355.html
lists.opensuse.org / opensuse-updates/2016-12/msg00127.html
Broken Link
lists.opensuse.org / opensuse-updates/2017-01/msg00050.html
Broken Link
lists.opensuse.org / opensuse-updates/2017-01/msg00053.html
Broken Link
access.redhat.com / errata/RHSA-2017:1220
Third Party Advisory
access.redhat.com / errata/RHSA-2017:1221
Third Party Advisory
access.redhat.com / errata/RHSA-2017:1222
Third Party Advisory
access.redhat.com / errata/RHSA-2017:2999
Third Party Advisory
access.redhat.com / errata/RHSA-2017:3046
Third Party Advisory
access.redhat.com / errata/RHSA-2017:3047
Third Party Advisory
access.redhat.com / errata/RHSA-2017:3453
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatch
github.com / madler/zlib/commit/e54e1299404101a5a9d0cf5e45512b543967f958
Patch
lists.debian.org / debian-lts-announce/2019/03/msg00027.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2020/01/msg00030.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201701-56
Third Party Advisory
security.gentoo.org / glsa/202007-54
Third Party Advisory
support.apple.com / HT208112
Third Party Advisory
support.apple.com / HT208113
Third Party Advisory
support.apple.com / HT208115
Third Party Advisory
support.apple.com / HT208144
Third Party Advisory
usn.ubuntu.com / 4246-1
Third Party Advisory
usn.ubuntu.com / 4292-1
Third Party Advisory
wiki.mozilla.org / images/0/09/Zlib-report.pdf
Third Party Advisory
wiki.mozilla.org / MOSS/Secure_Open_Source/Completed
Third Party Advisory
oracle.com / security-alerts/cpujul2020.html
Third Party Advisory
openwall.com / lists/oss-security/2016/12/05/21
Mailing ListPatch
oracle.com / technetwork/security-advisory/cpuoct2017-3236626.html
Third Party Advisory
oracle.com / technetwork/security-advisory/cpuoct2018-4428296.html
Third Party Advisory
securityfocus.com / bid/95131
Broken LinkThird Party AdvisoryVDB Entry
securitytracker.com / id/1039427
Broken LinkThird Party AdvisoryVDB Entry