VDB

CVE-2026-48487

CVE-2026-48487 PUBLISHED CVSS 5.3 MEDIUM

Reported by GitHub_M · Published July 17, 2026

Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.16, _read_character_string and _read_string in src/zeroconf/_protocol/incoming.py advanced self.offset by attacker-declared RDLENGTH without checking it against self._data_len, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to send a TXT, HINFO, or A/AAAA record with rdlength=65535 and seed DNSCache and ServiceInfo.properties with truncated, attacker-shaped key/value or address records. This issue is fixed in version 0.149.16.

Risk Scores

CVSS 4.0
5.3
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Affected Products

VendorProductVersions
python-zeroconfpython-zeroconf< 0.149.16
python-zeroconfpython-zeroconf< 0.149.16, < 0.149.16

Timeline

  • Jun 15, 2026 CVE Published
  • Jul 13, 2026 CVE Updated
  • Jul 17, 2026 Coalition ESS Score
  • Jul 18, 2026 EPSS Score
  • Jul 18, 2026 Security Advisory
  • Aug 7, 2026 EPSS Score
  • Aug 24, 2026 EPSS Score
  • Aug 30, 2026 EPSS Score

References

Open in Interactive Console →
$ Console Community · 100/wk Open console ›