# Libevent vulnerabilities

Source: https://junglewise.ai/threats/technologies/libevent  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/libevent.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 10 vulnerabilities in Libevent: 0 in the last 7 days and 10 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-63495, was published on 20 August 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 10
- All time: 10 (0 critical, 0 exploited in the wild)

## About Libevent

libevent is a C library for event-driven network programming across platforms.

## Latest Libevent vulnerabilities

- [CVE-2026-63495: Libevent WebSocket unbounded memory accumulation via frame fragmentation](https://junglewise.ai/threats/cve-2026-63495-libevent-websocket-unbounded-memory-accumulation-via-frame) (high, CVSS 7.5, published 20 Aug 2026)
- [CVE-2026-63388: Libevent heap out-of-bounds write in bufferevent_sock](https://junglewise.ai/threats/cve-2026-63388-libevent-heap-out-of-bounds-write-in-bufferevent-sock) (high, CVSS 8.4, published 20 Aug 2026)
- [CVE-2026-63387: Libevent off-by-one stack buffer overflow in DNS response parsing](https://junglewise.ai/threats/cve-2026-63387-libevent-off-by-one-stack-buffer-overflow-in-dns-response-parsing) (high, CVSS 7, published 20 Aug 2026)
- [CVE-2026-63385: Libevent HTTP parsing weaknesses in header validation and URI decoding](https://junglewise.ai/threats/cve-2026-63385-libevent-http-parsing-weaknesses-in-header-validation-and-uri) (info, published 20 Aug 2026)
- [CVE-2026-63384: Libevent integer overflow in evtag_unmarshal_header](https://junglewise.ai/threats/cve-2026-63384-libevent-integer-overflow-in-evtag-unmarshal-header) (info, CVSS 7.5, published 20 Aug 2026)
- [CVE-2026-63383: Libevent out-of-bounds read in event_tagging](https://junglewise.ai/threats/cve-2026-63383-libevent-out-of-bounds-read-in-event-tagging) (info, published 20 Aug 2026)
- [CVE-2026-63382: Libevent HTTP request smuggling via inconsistent Transfer-Encoding parsing](https://junglewise.ai/threats/cve-2026-63382-libevent-http-request-smuggling-via-inconsistent-transfer) (info, published 20 Aug 2026)
- [CVE-2026-63381: Libevent use-after-free in evbuffer_add_buffer_reference](https://junglewise.ai/threats/cve-2026-63381-libevent-use-after-free-in-evbuffer-add-buffer-reference) (info, published 20 Aug 2026)
- [CVE-2026-63380: Libevent null pointer dereference in evws_new_session error path](https://junglewise.ai/threats/cve-2026-63380-libevent-null-pointer-dereference-in-evws-new-session-error-path) (info, CVSS 0, published 20 Aug 2026)
- [CVE-2026-63379: Libevent HTTP chunked trailer header smuggling](https://junglewise.ai/threats/cve-2026-63379-libevent-http-chunked-trailer-header-smuggling) (info, CVSS 0, published 20 Aug 2026)

## Most severe Libevent vulnerabilities

- [CVE-2026-63388: Libevent heap out-of-bounds write in bufferevent_sock](https://junglewise.ai/threats/cve-2026-63388-libevent-heap-out-of-bounds-write-in-bufferevent-sock) (high, CVSS 8.4, published 20 Aug 2026)
- [CVE-2026-63495: Libevent WebSocket unbounded memory accumulation via frame fragmentation](https://junglewise.ai/threats/cve-2026-63495-libevent-websocket-unbounded-memory-accumulation-via-frame) (high, CVSS 7.5, published 20 Aug 2026)
- [CVE-2026-63387: Libevent off-by-one stack buffer overflow in DNS response parsing](https://junglewise.ai/threats/cve-2026-63387-libevent-off-by-one-stack-buffer-overflow-in-dns-response-parsing) (high, CVSS 7, published 20 Aug 2026)
- [CVE-2026-63384: Libevent integer overflow in evtag_unmarshal_header](https://junglewise.ai/threats/cve-2026-63384-libevent-integer-overflow-in-evtag-unmarshal-header) (info, CVSS 7.5, published 20 Aug 2026)
- [CVE-2026-63379: Libevent HTTP chunked trailer header smuggling](https://junglewise.ai/threats/cve-2026-63379-libevent-http-chunked-trailer-header-smuggling) (info, CVSS 0, published 20 Aug 2026)
- [CVE-2026-63380: Libevent null pointer dereference in evws_new_session error path](https://junglewise.ai/threats/cve-2026-63380-libevent-null-pointer-dereference-in-evws-new-session-error-path) (info, CVSS 0, published 20 Aug 2026)
- [CVE-2026-63382: Libevent HTTP request smuggling via inconsistent Transfer-Encoding parsing](https://junglewise.ai/threats/cve-2026-63382-libevent-http-request-smuggling-via-inconsistent-transfer) (info, published 20 Aug 2026)
- [CVE-2026-63385: Libevent HTTP parsing weaknesses in header validation and URI decoding](https://junglewise.ai/threats/cve-2026-63385-libevent-http-parsing-weaknesses-in-header-validation-and-uri) (info, published 20 Aug 2026)
- [CVE-2026-63383: Libevent out-of-bounds read in event_tagging](https://junglewise.ai/threats/cve-2026-63383-libevent-out-of-bounds-read-in-event-tagging) (info, published 20 Aug 2026)
- [CVE-2026-63381: Libevent use-after-free in evbuffer_add_buffer_reference](https://junglewise.ai/threats/cve-2026-63381-libevent-use-after-free-in-evbuffer-add-buffer-reference) (info, published 20 Aug 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 10 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Libevent vulnerabilities", https://junglewise.ai/threats/technologies/libevent, 9 November 2026.