CVE-2026-19538

NameCVE-2026-19538
DescriptionThe BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
nsd (PTS)bullseye4.3.5-1vulnerable
bookworm4.6.1-1vulnerable
trixie4.12.0-1vulnerable
forky, sid4.15.0-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
nsdsource(unstable)(unfixed)

Notes

https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt

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