The Quarterly Threat Landscape Report is out. See what attackers are targeting now.Read report
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a use-after-free in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero. evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer. A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libevent-docUpgrade libeventUpgrade libevent-devel | Oct 11, 2026 | Sep 16, 2026 |
| Debian | — | Upgrade libevent | Sep 21, 2026 | Aug 20, 2026 |
| Redhat_linux | — | Upgrade libevent-debugsourceUpgrade libevent-docUpgrade libeventUpgrade libevent-develUpgrade libevent-debuginfoNo solution exists | Aug 31, 2026 | Aug 20, 2026 |
| Rocky_linux | — | Upgrade libevent-debugsourceUpgrade libevent-develUpgrade libeventUpgrade libevent-debuginfo | Sep 18, 2026 | Sep 17, 2026 |
| Ubuntu | — | Upgrade libevent-extra-2.1-7 (Ubuntu Pro)Upgrade libevent-devUpgrade libevent-2.1-7 (Ubuntu Pro)Upgrade libevent-extra-2.1-7Upgrade libevent-2.1-7Upgrade libevent-2.0-5 (Ubuntu Pro)Upgrade libevent-extra-2.0-5 (Ubuntu Pro)Upgrade libevent-2.1-7t64Upgrade libevent-dev (Ubuntu Pro)Upgrade libevent-core-2.1-7t64Upgrade libevent-core-2.0-5 (Ubuntu Pro)Upgrade libevent-core-2.1-7Upgrade libevent-extra-2.1-6 (Ubuntu Pro)Upgrade libevent-extra-2.1-7t64Upgrade libevent-core-2.1-7 (Ubuntu Pro)Upgrade libevent-2.1-6 (Ubuntu Pro)Upgrade libevent-core-2.1-6 (Ubuntu Pro) | Sep 2, 2026 | Sep 1, 2026 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub