Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.5, DNSIncoming._decode_labels_at_offset recurses once per DNS-name compression pointer, and a single mDNS packet carrying chained pointers can trigger a RecursionError that escapes DNSIncoming.__init__, causing sustained CPU burn, log flooding, and degraded mDNS-dependent features for unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb). This issue is fixed in version 0.149.5.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.5,     DNSIncoming._decode_labels_at_offset recurses once per DNS-name compression pointer, and a single mDNS     packet carrying chained pointers can trigger a RecursionError that escapes DNSIncoming.__init__, causing     sustained CPU burn, log flooding, and degraded mDNS-dependent features for unauthenticated hosts on the     local link over UDP/5353 (224.0.0.251 / ff02::fb). This issue is fixed in version 0.149.5.
    (CVE-2026-47180)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21175-1 advisory.

    Changes in python-zeroconf:

    - CVE-2026-47180: zeroconf has unbounded recursion in DNS       compression-pointer decoder that allows LAN-local denial of service       (bsc#1268341)
    - CVE-2026-47183: zeroconf: Unbounded exception-dedup state retains       packet buffers via traceback frame locals, enabling LAN-local memory       exhaustion (bsc#1268342)
    - CVE-2026-47184: zeroconf has unbounded DNS record cache that allows       LAN-local memory exhaustion via multicast flood (bsc#1268343)
    - CVE-2026-48045: python-zeroconf: Unbounded TC-deferred queue allows       LAN-local memory exhaustion via spoofed-source flood (bsc#1268388)
    - CVE-2026-48487: python-zeroconf: Unvalidated rdlength in record       payload readers allows LAN-local cache corruption via crafted mDNS       packet (bsc#1268235)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.5,
    DNSIncoming._decode_labels_at_offset recurses once per DNS-name compression pointer, and a single mDNS
    packet carrying chained pointers can trigger a RecursionError that escapes DNSIncoming.__init__, causing
    sustained CPU burn, log flooding, and degraded mDNS-dependent features for unauthenticated hosts on the
    local link over UDP/5353 (224.0.0.251 / ff02::fb). This issue is fixed in version 0.149.5.
    (CVE-2026-47180)

ID	Name	Product	Family	Type	Severity
327762	Linux Distros Unpatched Vulnerability : CVE-2026-47180	Nessus	Misc.	Local	medium
324891	openSUSE 16 Security Update : python-zeroconf (openSUSE-SU-2026:21175-1)	Nessus	SuSE Local Security Checks	Local	medium
442529	SCA: security update for zeroconf (GHSA-9pgc-3ccv-5297)	Tenable Cloud Security	SCA Checks	Local	medium
442529	SCA: security update for zeroconf (GHSA-9pgc-3ccv-5297)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

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CVE-2026-47180

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