OESA-2026-2833 python-zeroconf security update

Pure Python Multicast DNS Service Discovery Library Bonjour/Avahi compatible Security Fixes: 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...

OESA-2026-2832 python-zeroconf security update

Pure Python Multicast DNS Service Discovery Library Bonjour/Avahi compatible Security Fixes: 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...

OPENSUSE-SU-2026:21175-1 Security update for python-zeroconf

This update for python-zeroconf fixes the following issues: Changes in python-zeroconf: - CVE-2026-47180: zeroconf has unbounded recursion in DNS compression-pointer decoder that allows LAN-local denial of service bsc1268341 - CVE-2026-47183: zeroconf: Unbounded exception-dedup state retains pack...

Improper Handling of Length Parameter Inconsistency

Overview zeroconf is a Pure Python Multicast DNS Service Discovery Library Bonjour/Avahi compatible Affected versions of this package are vulnerable to Improper Handling of Length Parameter Inconsistency via the readcharacterstring and readstring functions. An attacker can inject malicious...

GHSA-QC2X-6F54-M6H9 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...

PT-2026-49728

Name of the Vulnerable Software and Affected Versions zeroconf versions prior to 0.149.16 Description An issue exists where the functions read character string and read string in src/zeroconf/ protocol/incoming.py advance the self.offset by a declared length without verifying it against self. dat...

OPENSUSE-SU-2026:11036-1 python311-zeroconf-0.149.16-1.1 on GA media

These are all security issues fixed in the python311-zeroconf-0.149.16-1.1 package on the GA media of openSUSE Tumbleweed...

Allocation of Resources Without Limits or Throttling

Overview zeroconf is a Pure Python Multicast DNS Service Discovery Library Bonjour/Avahi compatible Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the AsyncListener.handlequeryordefer function. An attacker can exhaust system memory and...

GHSA-9663-MQMP-P9MM python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood

Impact AsyncListener.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...

PT-2026-48689

Name of the Vulnerable Software and Affected Versions zeroconf versions prior to 0.149.12 Description An unauthenticated host on the local link can cause a denial of service by streaming byte-distinct mDNS queries with the TC-bit truncation flag set to the AsyncListener.handle query or defer...

a2a-lite (>=0.1.0 <=0.2.2), adb-connect-qr (>=0.1.0 <=0.1.3) +595 more potentially affected by CVE-2026-47184 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-2026-47184 Source advisory: SNYK:PYTHON-ZEROCONF-17111094...

a2a-lite (>=0.1.0 <=0.2.2), adb-connect-qr (>=0.1.0 <=0.1.3) +568 more potentially affected by CVE-2026-47184 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-2026-47184 Source advisory: OSV:GHSA-RFG2-PJW2-56X2...

GHSA-RFG2-PJW2-56X2 zeroconf has unbounded DNS record cache that allows LAN-local memory exhaustion via multicast flood

Impact DNSCache.asyncadd inserted every response record into cache, expirations, expireheap, and servicecache with no cap on entry count. The only pre-existing protection was a PTR TTL floor DNSPTRMINTTL = 1125 s, RFC 6762 §10, which actually prolonged attacker-injected records, and a periodic...

Allocation of Resources Without Limits or Throttling

Overview zeroconf is a Pure Python Multicast DNS Service Discovery Library Bonjour/Avahi compatible Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the DNSCache.asyncadd. Any unauthenticated host on the local link can exhaust system...

zeroconf has unbounded DNS record cache that allows LAN-local memory exhaustion via multicast flood

Impact DNSCache.asyncadd inserted every response record into cache, expirations, expireheap, and servicecache with no cap on entry count. The only pre-existing protection was a PTR TTL floor DNSPTRMINTTL = 1125 s, RFC 6762 §10, which actually prolonged attacker-injected records, and a periodic...

GHSA-PHVX-9MGW-67R5 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...

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...

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...

Allocation of Resources Without Limits or Throttling

Overview zeroconf is a Pure Python Multicast DNS Service Discovery Library Bonjour/Avahi compatible Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the DNSIncoming.logexceptiondebug function and the exception-deduplication, which stores...

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...