CVE catalog
CVE-2026-48045
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.12, AsyncListener.handle_query_or_defer retained every truncated TC-bit incoming query, each up to _MAX_MSG_
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.37% · Oct 25, 2026
Zeroconf is a pure Python implementation of multicast DNS service discovery. Prior to 0.149.12, AsyncListener.handle_query_or_defer retained every truncated TC-bit incoming query, each up to _MAX_MSG_ABSOLUTE = 8966 bytes, in self._deferred[addr] and armed a per-address timer in self._timers[addr] without capping the per-address list or distinct addr keys, allowing unauthenticated hosts on the local link over UDP/5353 (224.0.0.251 / ff02::fb) to spoof sources, grow _deferred and _timers, and cause memory exhaustion and quadratic CPU burn. This issue is fixed in version 0.149.12.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-zeroconf | sid | 0.151.5-2 | fixed |
| Debian | python-zeroconf | forky | 0.151.5-2 | fixed |
| Debian | python-zeroconf | trixie | 0.147.0-1 | vulnerable |
| Debian | python-zeroconf | bookworm | 0.47.3-1 | vulnerable |
| Cpe | python-zeroconf | Not reported | Not reported | vulnerable |
| PyPI | zeroconf | Not reported | 0.149.12 | fixed |
| Cpe | zeroconf | Not reported | 0.149.12 | fixed |
| Ubuntu | python-zeroconf | 16.04 | 0.17.2-1 | vulnerable |
| Ubuntu | python-zeroconf | 16.04 | 0.17.4-1 | vulnerable |
| Ubuntu | python-zeroconf | 18.04 | 0.19.1-1 | vulnerable |
| Ubuntu | python-zeroconf | 20.04 | 0.21.3-1 | vulnerable |
| Ubuntu | python-zeroconf | 20.04 | 0.23.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 20.04 | 0.24.4-0ubuntu1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.26.1-1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.36.11-1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.36.12-1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.36.13-1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.37.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.38.1-1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.38.3-1 | vulnerable |
| Ubuntu | python-zeroconf | 22.04 | 0.38.3-2 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.76.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.119.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.126.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.127.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.128.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.128.0-2 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.128.4-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.129.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.130.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 24.04 | 0.131.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 26.04 | 0.147.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 26.04 | 0.148.0-1 | vulnerable |
| Ubuntu | python-zeroconf | 26.04 | 0.148.0-2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-zeroconf | source | sid | 0.149.16-1 | not yet assigned | Not reported | Not reported |
| Debian | python-zeroconf | source | forky | 0.149.16-1 | not yet assigned | Not reported | Not reported |
| Debian | python-zeroconf | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | python-zeroconf | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| PyPI | zeroconf | PyPI | Not reported | 0.149.12 | Not reported | PYSEC-2026-3435 | Not reported |
| Cpe | zeroconf | cpe | Not reported | 0.149.12 | Not reported | NVD-CVE-2026-48045 | Not reported |
Notes
[trixie] python-zeroconf: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-zeroconf]Affected
Source package: [python-zeroconf]
Details (2)
0.47.3-1· all · bookwormAffected
nvd · python-zeroconf · debian · bookworm; nvd · python-zeroconf · debian · 12
0.47.3-1· all · bookwormAffected
nvd · python-zeroconf · debian · bookworm; nvd · python-zeroconf · debian · 12
[Debian 13 (Trixie)]
- [python3-zeroconf]Affected
Source package: [python-zeroconf]
Details (2)
0.147.0-1· all · trixieAffected
nvd · python-zeroconf · debian · 13
0.147.0-1· all · trixieAffected
nvd · python-zeroconf · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_21175-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-48045]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-48045]
- [https://osv.dev/vulnerability/PYSEC-2026-3435]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-48045]
- [https://security-tracker.debian.org/tracker/CVE-2026-48045]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48045.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]