What’s Vulnerable › Vulnerabilities

CVE-2021-36976

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-20 · updated 2026-06-17
• Weakness: CWE-416

Description

libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

Affected products

• Apple iPadOS: before 15.4 — fixed in 15.4
• Apple Iphone Os: before 15.4 — fixed in 15.4
• Apple macOS: before 12.3 — fixed in 12.3
• Apple watchOS: before 8.5 — fixed in 8.5
• Fedoraproject Fedora: 35
• libarchive: from 3.4.1 through 3.5.2
• Splunk Universal Forwarder: from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 — fixed in 8.2.12, 9.0.6

How to fix

Upgrade to a fixed version: Apple iPadOS 15.4; Apple Iphone Os 15.4; Apple macOS 12.3; Apple watchOS 8.5; Splunk Universal Forwarder 8.2.12, 9.0.6. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2022/Mar/27
• http://seclists.org/fulldisclosure/2022/Mar/28
• http://seclists.org/fulldisclosure/2022/Mar/29
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32375
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libarchive/OSV-2021-557.yaml
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SE5NJQNM22ZE5Z55LPAGCUHSBQZBKMKC/
• https://security.gentoo.org/glsa/202208-26
• https://support.apple.com/kb/HT213182
• https://support.apple.com/kb/HT213183
• https://support.apple.com/kb/HT213193
• http://seclists.org/fulldisclosure/2022/Mar/27
• http://seclists.org/fulldisclosure/2022/Mar/28

Get alerted when CVE-2021-36976 or the next vulnerability affects your stack