Buffer overflow in Warmcat Libwebsockets
CVE-2026-78161
A vulnerability was found in warmcat libwebsockets 4.5.0. Impacted is the function report_raw_cbor of the file lib/misc/lecp.c of the component LECP CBOR Recording. The manipulation results in out-of-bounds write. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as 1d44554a1bb262db63ff4e240152a9deecd99054. It is best practice to apply a patch to resolve this issue.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Warmcat Libwebsockets — versions 4.5.0
Weakness classification (CWE)
References
- vuldb.com/vuln/394543 (technical-description, vdb-entry)
- vuldb.com/vuln/394543/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-78161 (third-party-advisory)
- vuldb.com/submit/883225 (third-party-advisory)
- github.com/biniamf/pocs/tree/main/libwebsockets-lecp-lecp_parse-cbor_pos_oob_wr… (exploit)
- github.com/biniamf/pocs/blob/main/libwebsockets-lecp-lecp_parse-cbor_pos_oob_wr… (exploit)
- github.com/warmcat/libwebsockets/commit/1d44554a1bb262db63ff4e240152a9deecd99054 (patch)
- github.com/warmcat/libwebsockets/ (product)
Frequently asked questions
- What is CVE-2026-78161?
- CVE-2026-78161 is a high-severity vulnerability in Warmcat Libwebsockets, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.3/10. Published 2026-08-24.
- How severe is CVE-2026-78161?
- High severity. CVSS v3 base score is 7.3 out of 10.