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No exploitation reportedFix available

CVE-2021-33196

No exploitation reported by the sources we read.

  • Published2021-08-02
  • Fixed in1.16.5 · 1.15.13
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In archive/zip in Go before 1.15.13 and 1.16.x before 1.16.5, a crafted file count (in an archive's header) can cause a NewReader or OpenReader panic.

Timeline

dates in UTC
  1. 2021-08-0219:15CVE publishedNVD

Versions per branch

NVD · OSV
Go
BranchAffectedFixed in
1.16≥ 1.16.0, < 1.16.51.16.5
1.16≥ 1.16.0-0, < 1.16.51.16.5
1.15< 1.15.131.15.13
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • coreos-installerRed Hat:openshift:4.9::el8all versions · fixed in 0:0.10.0-2.rhaos4.9.el8and 4 other packages
  • cri-oRed Hat:openshift:4.8::el8all versions · fixed in 0:1.21.2-8.rhaos4.8.git8d4264e.el8and 2 other packages
  • cri-oRed Hat:openshift:4.8::el7all versions · fixed in 0:1.21.2-8.rhaos4.8.git8d4264e.el7and 1 other package
  • delveRocky Linux:8all versions · fixed in 0:1.5.0-2.module+el8.4.0+396+d2d16ae3
  • delveRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:1.5.0-2.module+el8.4.0+8864+58b0fcdband 2 other packages
  • delveAlmaLinux:8all versions · fixed in 1.7.2-1.module_el8.6.0+2736+ec10aba8
  • goCleanStartall versions · fixed in 1.16.5-r0
  • goAlpine:v3.24from 1.16.0 · fixed in 1.16.5-r0

56 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-33196 Red Hat Product Security307 products fixed · 62 known affected

    golang: archive/zip: malformed archive may cause panic or memory exhaustion

    knative-eventing as a component of OpenShift Serverless · servicemesh as a component of OpenShift Service Mesh 2.0 · servicemesh-grafana as a component of OpenShift Service Mesh 2.0 · +59 more

  • RHSA-2021:3758 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.9.0 packages and security update

  • RHSA-2021:3556 Red Hat Product Security88 products fixed

    Red Hat Security Advisory: Release of OpenShift Serverless 1.17.0

  • RHSA-2021:3555 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of OpenShift Serverless Client kn 1.17.0

  • RHSA-2021:3361 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Migration Toolkit for Containers (MTC) 1.5.1 security and bug fix update

  • RHSA-2021:3229 Red Hat Product Security18 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Jaeger 1.20.5 security update

6 more advisories

Full record on NVD

Fix

  1. Update Go to 1.16.5 · 1.15.13
  2. Vendor fix Red Hat Product Security RHSA-2021:3758 · 7 productsFor OpenShift Container Platform 4.9 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-r…
  3. Vendor fix Red Hat Product Security RHSA-2021:3556 · 88 productsSee the Red Hat OpenShift Container Platform 4.6 documentation at: https://access.redhat.com/documentation/en-us/openshift_container_platform/4.6/html/serverless/index See the Red Hat OpenShift Container Platform 4.7 documentation at: https://access.redhat.com/documentation/en-us/openshift_containe…
  4. Vendor fix Red Hat Product Security RHSA-2021:3361 · 1 productFor details on how to install and use MTC, refer to: https://docs.openshift.com/container-platform/4.8/migration-toolkit-for-containers/installing-mtc.html
  5. Vendor fix Red Hat Product Security RHSA-2021:3229 · 18 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://docs.openshift.com/container-platform/4.8/jaeger/jaeger_install/rhbjaeger-updating.html
  6. Vendor fix Red Hat Product Security RHSA-2021:3076 · 23 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  7. Vendor fix Red Hat Product Security RHSA-2021:2983 · 9 productsFor OpenShift Container Platform 4.8 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.8/release_notes/ocp-4-8-r…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-08-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-6r28-26q2-vxwj

Frequently asked questions

What is CVE-2021-33196?

In archive/zip in Go before 1.15.13 and 1.16.x before 1.16.5, a crafted file count (in an archive's header) can cause a NewReader or OpenReader panic.

Is CVE-2021-33196 actively exploited?

Active exploitation of CVE-2021-33196 has not been confirmed. Its EPSS score was 3.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33196?

CVE-2021-33196 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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