CVE-2026-48487CWE-130

CVE-2026-48487

Medium · published July 17, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
39.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00467 · 39.4th percentile
Weakness
CWE-130 · Improper Handling of Length Parameter Inconsistency
Published
2026-07-17T23:17Z
Affected products (1)
ProductVersionsFixed in
paulsm/zeroconf< 0.149.160.149.16
References (5)
https://github.com/python-zeroconf/python-zeroconf/commit/544449596e645fcaad3834fa0cb614a54f847a82 · [email protected]https://github.com/python-zeroconf/python-zeroconf/issues/1752 · [email protected]https://github.com/python-zeroconf/python-zeroconf/pull/1756 · [email protected]https://github.com/python-zeroconf/python-zeroconf/releases/tag/0.149.16 · [email protected]https://github.com/python-zeroconf/python-zeroconf/security/advisories/GHSA-qc2x-6f54-m6h9 · [email protected]
EPSS history
Timeline
  • 17 JUL 18:28Z
    Zeroconf: Unvalidated rdlength in record payload readers allows LAN-local cache corruption via crafted mDNS packet
    cvelistv5