CVE-2026-47184

A flaw was found in Zeroconf, a Python library for multicast DNS service discovery. An unauthenticated attacker on the local network can send specially crafted multicast DNS responses. This can lead to uncontrolled memory growth, causing memory exhaustion and significantly degrading the performan...

CVE-2026-47183

A flaw was found in zeroconf, a Python implementation of multicast DNS mDNS service discovery. An unauthenticated attacker on the local network can send specially crafted mDNS messages, causing the system to store an unbounded number of error messages. This can lead to excessive memory consumptio...

Linux Distros Unpatched Vulnerability : CVE-2026-48487

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 0.149.16, readcharacterstring and readstring in...

CVE-2026-48487

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.16, readcharacterstring and readstring in src/zeroconf/protocol/incoming.py advanced self.offset by attacker-declared RDLENGTH without checking it against self.datalen, allowing unauthenticated hosts on th...

CVE-2026-48487

CVE-2026-48487 (python-zeroconf) : Prior to 0.149.16, _read_character_string and _read_string in zeroconf’s incoming protocol could advance the parser past the end of the payload by using attacker-declared RDLENGTH without checking against data length, enabling unauthenticated LAN-local hosts on ...

CVE-2026-48487 Zeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.16, readcharacterstring and readstring in src/zeroconf/protocol/incoming.py advanced self.offset by attacker-declared RDLENGTH without checking it against self.datalen, allowing unauthenticated hosts on th...

CVE-2026-48487 Zeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.16, readcharacterstring and readstring in src/zeroconf/protocol/incoming.py advanced self.offset by attacker-declared RDLENGTH without checking it against self.datalen, allowing unauthenticated hosts on th...

CVE-2026-47183

CVE-2026-47183 - zeroconf (python-zeroconf) : Affected versions prior to 0.149.6 store an unbounded in-memory log of exceptions in DNSIncoming._log_exception_debug and QuietLogger dedup, retaining frame locals with raw packet data. This enables any unauthenticated LAN host on UDP/5353 (224.0.0.25...

CVE-2026-47183

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.6, DNSIncoming.logexceptiondebug and the four QuietLogger exception-dedup methods stored an unbounded seenlogs dictionary keyed by attacker-influenced IncomingDecodeError messages, retaining sys.excinfo...

PYSEC-2026-3438 zeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet

Impact readcharacterstring and readstring in src/zeroconf/protocol/incoming.py sliced self.dataself.offset : self.offset + length and advanced self.offset by the declared length without checking it against self.datalen. Python's slice silently returns fewer bytes when the end index runs past the...

python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood

ImpactAsyncListener.handlequeryordefer retained every truncated TC-bit incoming query in self.deferredaddr and armed a per-addr timer in self.timersaddr that flushed the reassembled query within 500 ms RFC 6762 §18.5. Neither the per-addr list nor the number of distinct addr keys was capped, and...

PYSEC-2026-3436 zeroconf has unbounded recursion in DNS compression-pointer decoder that allows LAN-local denial of service

Impact DNSIncoming.decodelabelsatoffset recurses once per DNS-name compression pointer RFC 1035 §4.1.4. Pointer cycles and label counts were capped, but the chain length of unique forward pointers was not. A single 3 kB mDNS packet carrying 1500 chained pointers drives the recursion past CPython'...

PYSEC-2026-3437 zeroconf: Unbounded exception-dedup state retains packet buffers via traceback frame locals, enabling LAN-local memory exhaustion

Impact DNSIncoming.logexceptiondebug and the four QuietLogger exception-dedup methods stored an unbounded seenlogs dict keyed by strsys.excinfo1. The seven IncomingDecodeError messages raised from readname / decodelabelsatoffset RFC 6762 §18 name-decoding error paths all embed self.source — the...

PT-2026-60048

Impact DNSCache. async add inserted every response record into cache, expirations, expire heap, and service cache with no cap on entry count. The only pre-existing protection was a PTR TTL floor DNS PTR MIN TTL = 1125 s, RFC 6762 §10, which actually prolonged attacker-injected records, and a...

autonet-computer (>=0.1.2 <=0.1.3), cir1-hldns (=1.6.14) +35 more potentially affected by CVE-2026-48487 via zeroconf (>=0.140.1 <=0.149.12)

zeroconf PYPI version =0.140.1, =0.1.2, =2025.2.0, =2026.5.0, =2026.5.0, =0.1.0, =3.0.0, =0.0.1, =1.0.0, =0.2.9, =0.6.0 - matrix-alt-cameras =0.0.1 and more Source cves: CVE-2026-48487 Source advisory: OSV:GHSA-QC2X-6F54-M6H9...

adb-wifi-qr (=0.2.0), autonet-computer (>=0.1.2 <=0.1.3) +77 more potentially affected by CVE-2026-48045 via zeroconf (>=0.102.0 <=0.148.0)

zeroconf PYPI version =0.102.0, =0.1.2, =0.4.3.0, =1.4.0, =0.3.0, =1.1.0, =0.0.11, =0.1.24, =0.2.6, =2023.9.0, =0.1.688, =0.1.754 and more Source cves: CVE-2026-48045 Source advisory: SNYK:PYTHON-ZEROCONF-17318192...

autonet-computer (>=0.1.2 <=0.1.3), cir1-hldns (=1.6.14) +35 more potentially affected by CVE-2026-48045 via zeroconf (>=0.140.1 <=0.148.0)

zeroconf PYPI version =0.140.1, =0.1.2, =2025.2.0, =2026.5.0, =2026.5.0, =0.1.0, =3.0.0, =0.0.1, =1.0.0, =0.2.9, =0.6.0 - matrix-alt-cameras =0.0.1 and more Source cves: CVE-2026-48045 Source advisory: OSV:GHSA-9663-MQMP-P9MM...

a2a-lite (>=0.1.0 <=0.2.2), adb-connect-qr (>=0.1.0 <=0.1.3) +595 more potentially affected by CVE-2026-47183 via zeroconf (>=0.102.0 <=0.149.3)

zeroconf PYPI version =0.102.0, =0.1.0, =0.1.0, =0.1.0, =1.0.2, =1.0.1, =0.0.1, =1.4.8, =2.6.28, =0.7.1, =0.0.1, =1.7.0, =45.3.1 and more Source cves: CVE-2026-47183 Source advisory: SNYK:PYTHON-ZEROCONF-17111092...

a2a-lite (>=0.1.0 <=0.2.2), adb-connect-qr (>=0.1.0 <=0.1.3) +568 more potentially affected by CVE-2026-47183 via zeroconf (>=0.140.1 <=0.149.3)

zeroconf PYPI version =0.140.1, =0.1.0, =0.1.0, =0.1.0, =1.0.2, =1.0.1, =0.0.1, =1.4.8, =2.6.28, =0.7.1, =0.0.1, =1.7.0, =0.2.38, =3.2.20 and more Source cves: CVE-2026-47183 Source advisory: OSV:GHSA-PHVX-9MGW-67R5...