PT-2026-58240

Use after free in Reliable Multicast Transport Driver RMCAST allows an unauthorized attacker to execute code over a network...

PT-2026-58003

A vulnerability has been identified in SIMATIC S7-PLCSIM Advanced All versions. Affected devices do not properly handle high-volume multicast network traffic, which can exhaust available memory resources in the affected application. This could allow an unauthenticated attacker on the local networ...

CVE-2026-54982: Integer Underflow (Wrap or Wraparound)

Integer underflow wrap or wraparound in Reliable Multicast Transport Driver RMCAST allows an unauthorized attacker to execute code over an adjacent network...

CVE-2026-54429: Allocation of Resources Without Limits or Throttling

A vulnerability has been identified in SIMATIC S7-PLCSIM Advanced All versions. Affected devices do not properly handle high-volume multicast network traffic, which can exhaust available memory resources in the affected application. This could allow an unauthenticated attacker on the local networ...

Weblate SSRF: outbound URL guard misses some private ranges

ImpactWeblate's VCSRESTRICTPRIVATE did not properly account for some transitional IPv6 ranges, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresses to bypass private range restrictions. Patches https://github.com/WeblateOrg/weblate/pull/19768 ResourcesThe issue was...

PYSEC-2026-3416 Weblate SSRF: outbound URL guard misses some private ranges

Impact Weblate's VCSRESTRICTPRIVATE did not properly account for some transitional IPv6 ranges, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresses to bypass private range restrictions. Patches https://github.com/WeblateOrg/weblate/pull/19768 Resources The issue wa...

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

Impactreadcharacterstring 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...

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...

PYSEC-2026-3435 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...

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-2026-3439 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...

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

ImpactDNSIncoming.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...

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

ImpactDNSCache.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...

PYSEC-2026-3050 requests-hardened is Vulnerable to Server-Side Request Forgery

The SSRF protection in requests-hardened prior to version 1.2.1 fails to block IP addresses within the RFC 6598 Shared Address Space 100.64.0.0/10. An attacker who can supply arbitrary URLs to requests-hardened could exploit this gap to access internal services hosted within 100.64.0.0/10. This i...

PT-2026-60047

Impact read character string and read string 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. data len. Python's slice silently returns fewer bytes when the end index runs pas...

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...

PT-2026-60044

Impact AsyncListener.handle query or defer 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...

PT-2026-60045

Impact DNSIncoming. decode labels at offset 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...

PT-2026-60027

Impact Weblate's VCS RESTRICT PRIVATE did not properly account for some transitional IPv6 ranges, multicast addresses, or some semi-private IPv4 ranges, which allowed some addresses to bypass private range restrictions. Patches https://github.com/WeblateOrg/weblate/pull/19768 Resources The issue...

PT-2026-60046

Impact DNSIncoming. log exception debug and the four QuietLogger exception-dedup methods stored an unbounded seen logs dict keyed by strsys.exc info1. The seven IncomingDecodeError messages raised from read name / decode labels at offset RFC 6762 §18 name-decoding error paths all embed self.sourc...