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CVE Watch24 jul 2026

CVE-2026-40691

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails

CVSS

7.5

Alto

EPSS

0.3%

p22

KEV

—

Exploit Today

6

0-100

Publicado: 22 jul 2026 · Última mod.: 24 jul 2026 · CWE-122 · CWE-787

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-08-102026-09-07

Descripción técnica

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger than 65504 bytes is shifted forward by 48 bytes inside a buffer of capacity equal to 'msg-buffer-size', writing past the end of the heap allocation. A single malicious encrypted query crashes the resolver and lead to denial of service. This vulnerability needs Unbound to be compiled with DNSCrypt support ('--enable-dnscrypt') and the 'dnscrypt:' clause to be configured and enabled for the listening interfaces.

Referencias oficiales

www.nlnetlabs.nlhttps://www.nlnetlabs.nl/downloads/unbound/CVE-2026-40691.txt

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