CVE-2026-8966
published 2026-05-19CVE-2026-8966: Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
PriorityP340high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.33%
25.4th percentile
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 151 | Firefox 151 |
| mozilla | firefox | < 151.0.0 | 151.0.0 |
| mozilla | thunderbird | < Thunderbird 151 | Thunderbird 151 |
| mozilla | thunderbird | < 151.0.0 | 151.0.0 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_redhat7.5HIGH
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GHSA
python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood
ghsa·2026-06-11
CVE-2026-48045 [MEDIUM] CWE-400 python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood
python-zeroconf: Unbounded TC-deferred queue allows LAN-local memory exhaustion via spoofed-source flood
### Impact
`AsyncListener.handle_query_or_defer` retained every truncated (TC-bit) incoming query in `self._deferred[addr]` and armed a per-addr timer in `self._timers[addr]` 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 the dedup check (`for incoming in reversed(deferred): if incoming.data == msg.data`) ran O(N) over the per-addr list on every arrival.
Any unauthenticated host on the local link (UDP/5353, `224.0.0.251` / `ff02::fb`) can stream byte-distinct TC-flagged mDNS queries — each up to `_MAX_MSG_ABSOLUTE = 8966` bytes, with `DNSIncoming` retaining the raw `data` buffer plus
GHSA
GHSA-wq4p-4w8c-6qcg: Information disclosure in the IP Protection component
ghsa_unreviewed·2026-05-19
CVE-2026-8966 [HIGH] CWE-200 GHSA-wq4p-4w8c-6qcg: Information disclosure in the IP Protection component
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151.
VulDB
Mozilla Firefox up to 150 IP Protection information disclosure
vuldb·2026-05-19
CVE-2026-8966 [LOW] Mozilla Firefox up to 150 IP Protection information disclosure
A vulnerability, which was classified as problematic, was found in Mozilla Firefox up to 150. Affected is an unknown function of the component IP Protection Component. Executing a manipulation can lead to information disclosure.
This vulnerability is registered as CVE-2026-8966. It is possible to launch the attack remotely. No exploit is available.
You should upgrade the affected component.
Red Hat
firefox: thunderbird: Information disclosure in the IP Protection component
vendor_redhat·2026-05-19·CVSS 7.5
CVE-2026-8966 [HIGH] firefox: thunderbird: Information disclosure in the IP Protection component
firefox: thunderbird: Information disclosure in the IP Protection component
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Information disclosure in the IP Protection component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Not affected
Package: f
Mozilla
Mozilla Foundation Security Advisory 2026-50: CVE-2026-8966
vendor_mozilla
CVE-2026-8966 Mozilla Foundation Security Advisory 2026-50: CVE-2026-8966
Mozilla Foundation Security Advisory 2026-50
CVE: CVE-2026-8966
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 151
Mozilla
Mozilla Foundation Security Advisory 2026-46: CVE-2026-8966
vendor_mozilla
CVE-2026-8966 Mozilla Foundation Security Advisory 2026-46: CVE-2026-8966
Mozilla Foundation Security Advisory 2026-46
CVE: CVE-2026-8966
Product: Firefox
Impact: high
Fixed in: Firefox 151
No detection rules found.
No public exploits indexed.
2026-05-19
Published