CVE-2026-63387

Katalog CVE

CVSS 7.0 · High EPSS 0,42%

Kerentanan Stack-based Buffer Overflow. Skor CVSS 3.1 7.0 (High) menurut github.com.

Deskripsi (NVD)

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an off-by-one stack buffer overflow in evdns.c when dnsname_to_labels formats a name-bearing DNS record at the end of the 64 KB stack buffer allocated by evdns_server_request_format_response. The final-label check permits j plus label_len plus one to equal buf_len, after which the terminating null byte is written to buf[buf_len]. A crafted DNS server response containing PTR, CNAME, MX, NS, or SOA data can trigger the one-byte out-of-bounds write and crash or corrupt the process. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.

Rincian

Terbit di NVD

20 Agustus 2026

Terakhir diubah

9 September 2026

Status NVD

Awaiting Analysis

CVSS 3.1

7.0 (High), sumber github.com
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-121: Stack-based Buffer Overflow
CWE-193: Off-by-one Error
CWE-787: Out-of-bounds Write

EPSS (30 hari)

0,42% peluang dieksploitasi; lebih tinggi dari 34,0% CVE lain

Produk dan versi terdampak

NVD belum mencantumkan data produk (CPE) untuk CVE ini. Produk yang terdampak biasanya disebut di deskripsi dan di advisory vendor pada daftar referensi.

Referensi dan perbaikan

• https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable
• https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha
• https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47