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CVE-2016-9841· NVD / CVE Program· CNA microfocus

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

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
May 23, 2017
Updated
Jul 14, 2026
EPSS
7.6% · 94th percentile
CWE
—
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JSON

Action score

41

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 7.6%

Affected systems

VendorProduct
zlibzlib
opensuseleap
opensuseopensuse
debiandebian linux
canonicalubuntu linux
oracledatabase server
oraclejdk
oraclejre
oraclemysql
redhatsatellite
redhatenterprise linux desktop
redhatenterprise linux eus

and 27 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • nodejs node.js4.0.0 and later · up to 4.1.2 inclusive
  • nodejs node.js7.0.0 and later · before 7.6.0
  • nodejs node.js6.9.0 and later · before 6.10.2
  • nodejs node.js6.0.0 and later · up to 6.8.1 inclusive
  • nodejs node.js4.2.0 and later · before 4.8.2
  • oracle jdk1.6.0
  • oracle jdk1.7.0
  • oracle jdk1.8.0
  • oracle jre1.6.0
  • oracle jre1.7.0
  • oracle jre1.8.0
  • oracle mysql5.5.0 and later · up to 5.5.61 inclusive
  • oracle mysql8.0.0 and later · up to 8.0.12 inclusive
  • oracle mysql5.7.0 and later · up to 5.7.23 inclusive
  • oracle mysql5.6.0 and later · up to 5.6.41 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.3zlibfrom 1.2.0 · before 1.2.11-r01.2.11-r0
Alpine:v3.5perlbefore 5.24.3-r15.24.3-r1
Debian:12rsyncbefore 3.1.3-63.1.3-6
Debian:12zlibbefore 1:1.2.8.dfsg-41:1.2.8.dfsg-4
Debian:8rsyncbefore 3.1.1-3+deb8u23.1.1-3+deb8u2
Debian:8zlibbefore 1:1.2.8.dfsg-2+deb8u11:1.2.8.dfsg-2+deb8u1
Red Hat:network_satellite:5.8::el6java-1.8.0-ibmbefore 1:1.8.0.5.5-1jpp.1.el6_91:1.8.0.5.5-1jpp.1.el6_9
Red Hat:network_satellite:5.8::el6java-1.8.0-ibm-develbefore 1:1.8.0.5.5-1jpp.1.el6_91:1.8.0.5.5-1jpp.1.el6_9
Red Hat:rhel_extras_oracle_java:6java-1.6.0-sunbefore 1:1.6.0.171-1jpp.4.el61:1.6.0.171-1jpp.4.el6
Red Hat:rhel_extras_oracle_java:6java-1.6.0-sun-demobefore 1:1.6.0.171-1jpp.4.el61:1.6.0.171-1jpp.4.el6
Red Hat:rhel_extras_oracle_java:6java-1.6.0-sun-develbefore 1:1.6.0.171-1jpp.4.el61:1.6.0.171-1jpp.4.el6
Red Hat:rhel_extras_oracle_java:6java-1.6.0-sun-jdbcbefore 1:1.6.0.171-1jpp.4.el61:1.6.0.171-1jpp.4.el6
Red Hat:rhel_extras_oracle_java:6java-1.6.0-sun-pluginbefore 1:1.6.0.171-1jpp.4.el61:1.6.0.171-1jpp.4.el6
Red Hat:rhel_extras_oracle_java:6java-1.6.0-sun-srcbefore 1:1.6.0.171-1jpp.4.el61:1.6.0.171-1jpp.4.el6
Red Hat:rhel_extras_oracle_java:6java-1.7.0-oraclebefore 1:1.7.0.161-1jpp.3.el61:1.7.0.161-1jpp.3.el6
Red Hat:rhel_extras_oracle_java:6java-1.7.0-oracle-develbefore 1:1.7.0.161-1jpp.3.el61:1.7.0.161-1jpp.3.el6
Red Hat:rhel_extras_oracle_java:6java-1.7.0-oracle-javafxbefore 1:1.7.0.161-1jpp.3.el61:1.7.0.161-1jpp.3.el6
Red Hat:rhel_extras_oracle_java:6java-1.7.0-oracle-jdbcbefore 1:1.7.0.161-1jpp.3.el61:1.7.0.161-1jpp.3.el6
Red Hat:rhel_extras_oracle_java:6java-1.7.0-oracle-pluginbefore 1:1.7.0.161-1jpp.3.el61:1.7.0.161-1jpp.3.el6
Red Hat:rhel_extras_oracle_java:6java-1.7.0-oracle-srcbefore 1:1.7.0.161-1jpp.3.el61:1.7.0.161-1jpp.3.el6
Red Hat:rhel_extras_oracle_java:6java-1.8.0-oraclebefore 1:1.8.0.151-1jpp.1.el61:1.8.0.151-1jpp.1.el6
Red Hat:rhel_extras_oracle_java:6java-1.8.0-oracle-develbefore 1:1.8.0.151-1jpp.1.el61:1.8.0.151-1jpp.1.el6
Red Hat:rhel_extras_oracle_java:6java-1.8.0-oracle-javafxbefore 1:1.8.0.151-1jpp.1.el61:1.8.0.151-1jpp.1.el6
Red Hat:rhel_extras_oracle_java:6java-1.8.0-oracle-jdbcbefore 1:1.8.0.151-1jpp.1.el61:1.8.0.151-1jpp.1.el6

+69

Same product

zlib: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-25032zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.
    46Plan
  • CVE-2022-37434zlib through 1.2.12 has a heap-based buffer over-read or buffer overflow in inflate in inflate.c via a large gzip header extra field.
    45Plan
  • CVE-2002-0059The decompression algorithm in zlib 1.1.3 and earlier, as used in many different utilities and packages, causes inflateEnd to release certai
    42Plan
  • CVE-2016-9843The crc32_big function in crc32.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving big
    41Plan
  • CVE-2023-45853MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename,
    40Plan
  • CVE-2003-0107Buffer overflow in the gzprintf function in zlib 1.1.4, when zlib is compiled without vsnprintf or when long inputs are truncated using vsnp
    38Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:perl5.24.3-r1 · Alpine:v3.5Package registry (OSV)
alpine:zlib1.2.11-r0 · Alpine:v3.3Package registry (OSV)
debian:rsync3.1.3-6 · Debian:12Package registry (OSV)
debian:zlib1:1.2.8.dfsg-4 · Debian:12Package registry (OSV)
red hat:java-1.7.1-ibm1:1.7.1.4.5-1jpp.2.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.7.1-ibm-demo1:1.7.1.4.5-1jpp.2.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.7.1-ibm-devel1:1.7.1.4.5-1jpp.2.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.7.1-ibm-jdbc1:1.7.1.4.5-1jpp.2.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.7.1-ibm-plugin1:1.7.1.4.5-1jpp.2.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.7.1-ibm-src1:1.7.1.4.5-1jpp.2.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.8.0-ibm1:1.8.0.4.5-1jpp.1.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.8.0-ibm-demo1:1.8.0.4.5-1jpp.1.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.8.0-ibm-devel1:1.8.0.4.5-1jpp.1.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.8.0-ibm-jdbc1:1.8.0.4.5-1jpp.1.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.8.0-ibm-plugin1:1.8.0.4.5-1jpp.1.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
red hat:java-1.8.0-ibm-src1:1.8.0.4.5-1jpp.1.el6_9 · Red Hat:rhel_extras:6Package registry (OSV)
suse:java-1_6_0-ibm1.6.0_sr16.45-49.1 · SUSE:Linux Enterprise Module for Legacy 12Package registry (OSV)
suse:java-1_7_0-ibm1.7.0_sr10.5-64.1 · SUSE:Linux Enterprise Point of Sale 11 SP3Package registry (OSV)
suse:java-1_7_0-openjdk1.7.0.161-43.7.6 · SUSE:OpenStack Cloud 6Package registry (OSV)
suse:java-1_7_1-ibm1.7.1_sr4.5-37.1 · SUSE:Linux Enterprise Server for SAP Applications 12Package registry (OSV)
suse:java-1_8_0-ibm1.8.0_sr4.5-29.1 · SUSE:Linux Enterprise Software Development Kit 12 SP1Package registry (OSV)
suse:java-1_8_0-openjdk1.8.0.151-27.8.1 · SUSE:OpenStack Cloud 6Package registry (OSV)
suse:zlib1.2.7-0.14.1 · SUSE:Linux Enterprise Software Development Kit 11 SP4Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records