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Fencer Vulns
critical 9.8

CVE-2020-36328 json

A flaw was found in libwebp in versions before 1.0.1.

published 2021-05-21 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-23865

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

A flaw was found in libwebp in versions before 1.0.1. A heap-based buffer overflow in function WebPDecodeRGBInto is possible due to an invalid check for buffer size. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Patch / fix

  • webmproject libwebp 1.0.1
  • libwebp Debian 14, Debian 13, Debian 12 0.6.1-2.1

debian advisories DEBIAN-CVE-2020-36328

  • libwebp Ubuntu 18.04 LTS 0.6.1-2ubuntu0.18.04.1
  • libwebp Ubuntu 20.04 LTS 0.6.1-2ubuntu0.20.04.1
  • libwebp Ubuntu Pro 14.04 LTS 0.4.0-4ubuntu0.1~esm1
  • libwebp Ubuntu Pro 16.04 LTS 0.4.4-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-36328

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • qt5-qtimageformats RHEL 7 5.9.7-2.el7_9
  • libwebp RHEL 8 1.0.0-3.el8_4
  • libwebp RHEL 7 0.3.0-10.el7_9
  • libwebp-java RHEL 7 0.3.0-10.el7_9
  • libwebp-tools RHEL 7 0.3.0-10.el7_9
  • libwebp RHEL 8.1 EUS 1.0.0-4.el8_1
  • libwebp RHEL 8.2 EUS 1.0.0-4.el8_2

red hat advisories RHSA-2021:2328RHSA-2021:2365RHSA-2021:2364RHSA-2021:2354RHSA-2021:2260

  • libwebp SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +14 more 0.5.0-3.5.1

suse advisories SUSE-SU-2021:1860-1

  • libwebp openSUSE Leap 15.3 0.5.0-3.5.1

opensuse advisories openSUSE-SU-2021:1860-1

  • libwebp Rocky Linux 8 1.0.0-3.el8_4

rocky linux advisories RLSA-2021:2354

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-36328 updated cvss 9.8

libwebp: heap-based buffer overflow in WebPDecode*Into functions

  • Red Hat Enterprise Linux AppStream (v. 8) libwebp 1.0.0-3.el8_4
    fixed: vendor fix RHSA-2021:2354
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) libwebp 1.0.0-4.el8_1
    fixed: vendor fix RHSA-2021:2365
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) libwebp 1.0.0-4.el8_2
    fixed: vendor fix RHSA-2021:2364
  • Red Hat Enterprise Linux Client (v. 7) libwebp 0.3.0-10.el7_9, libwebp-java 0.3.0-10.el7_9, libwebp-tools 0.3.0-10.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) libwebp 0.3.0-10.el7_9, libwebp-java 0.3.0-10.el7_9, libwebp-tools 0.3.0-10.el7_9 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libwebp 0.3.0-10.el7_9, libwebp-java 0.3.0-10.el7_9, libwebp-tools 0.3.0-10.el7_9 Red Hat Enterprise Linux Server (v. 7) libwebp 0.3.0-10.el7_9, libwebp-java 0.3.0-10.el7_9, libwebp-tools 0.3.0-10.el7_9, qt5-qtimageformats 5.9.7-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) libwebp 0.3.0-10.el7_9, libwebp-java 0.3.0-10.el7_9, libwebp-tools 0.3.0-10.el7_9, qt5-qtimageformats 5.9.7-2.el7_9 Red Hat Enterprise Linux Workstation (v. 7) libwebp 0.3.0-10.el7_9, libwebp-java 0.3.0-10.el7_9, libwebp-tools 0.3.0-10.el7_9, qt5-qtimageformats 5.9.7-2.el7_9
    +1 more products
    Red Hat Enterprise Linux Workstation Optional (v. 7) libwebp 0.3.0-10.el7_9, libwebp-java 0.3.0-10.el7_9, libwebp-tools 0.3.0-10.el7_9, qt5-qtimageformats 5.9.7-2.el7_9
    fixed: vendor fix RHSA-2021:2260
  • Red Hat Migration Toolkit 1.4 rhmtc/openshift-migration-ui-rhel8 v1.4.6-4, rhmtc/openshift-velero-plugin-rhel8 v1.4.6-4, rhmtc/openshift-migration-velero-rhel8 v1.4.6-5, rhmtc/openshift-migration-registry-rhel8 v1.4.6-4, rhmtc/openshift-migration-operator-bundle v1.4.6-5, rhmtc/openshift-migration-controller-rhel8 v1.4.6-4, +7 more
    fixed: vendor fix RHBA-2021:2854
  • Red Hat Enterprise Linux 7 firefox, thunderbird Red Hat Enterprise Linux 8 firefox, thunderbird Red Hat Enterprise Linux 9 libwebp, libwebp-tools
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.66% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a libwebp

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.