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Fencer Vulns
critical 9.8

CVE-2020-36329 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-2020-23866

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

A flaw was found in libwebp in versions before 1.0.1. A use-after-free was found due to a thread being killed too early. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Patch / fix

  • webmproject libwebp 1.0.1
  • apple ipados 14.7
  • apple iphone_os 14.7
  • libwebp Debian 14, Debian 13, Debian 12 0.6.1-2.1

debian advisories DEBIAN-CVE-2020-36329

  • 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-2020-36329

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
  • libwebp SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +12 more 0.4.3-4.7.1

suse advisories SUSE-SU-2021:1860-1SUSE-SU-2021:1830-1

  • 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-2020-36329 updated cvss 9.8

libwebp: use-after-free in EmitFancyRGB() in dec/io_dec.c

  • 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

2.32% chance of exploitation in the next 30 days, higher than 83% 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.