Linux Distros Unpatched Vulnerability : CVE-2026-55953
| Reporter | Title | Published | Views | Family All 18 |
|---|---|---|---|---|
 | Erlang/OTP -- (D)TLS-1.2 server certificate verification bypass | 27 Jul 202600:00 | – | freebsd |
 | CVE-2026-55953 | 27 Jul 202615:21 | – | attackerkb |
 | CVE-2026-55953 | 27 Jul 202617:12 | – | circl |
 | CVE-2026-55953 | 27 Jul 202615:21 | – | cve |
 | CVE-2026-55953 TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authentication | 27 Jul 202615:21 | – | cvelist |
 | CVE-2026-55953 | 27 Jul 202615:21 | – | debiancve |
 | EUVD-2026-49323 | 27 Jul 202615:21 | – | euvd |
 | FreeBSD : Erlang/OTP -- (D)TLS-1.2 server certificate verification bypass (445c61c0-89e1-11f1-b35c-4c526214c986) | 28 Jul 202600:00 | – | nessus |
 | CVE-2026-55953 | 27 Jul 202616:17 | – | nvd |
 | CVE-2026-55953 TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authentication | 27 Jul 202615:21 | – | osv |
10
| Source | Link |
|---|---|
| security-tracker | www.security-tracker.debian.org/tracker/CVE-2026-55953 |
| ubuntu | www.ubuntu.com/security/CVE-2026-55953 |
| cve | www.cve.mitre.org/cgi-bin/cvename.cgi |
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- The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by
the server in ServerHello was among the suites offered by the client in ClientHello. The client-side
tls_handshake:hello/5 handler validates the negotiated protocol version and the downgrade sentinel but
hands the server-chosen suite directly to ssl_handshake:handle_server_hello_extensions/9, which installs
it without a membership check. The TLS 1.3 client path performs this check (per RFC 8446), so it is not
affected. An on-path attacker between the client and the intended server can respond with a ServerHello
selecting an anonymous key exchange suite such as TLS_DH_anon_* or TLS_ECDH_anon_* that the client never
offered. Anonymous suites do not require the server to present a certificate, so the entire verify_peer
and cacerts configuration is bypassed: the attacker completes the handshake with its own ephemeral
parameters, no certificate is validated, no hostname is checked, and ssl:connect returns {ok, Socket}. All
subsequent application traffic is readable and modifiable by the attacker. This issue affects OTP from OTP
17.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to ssl from 5.3.4 before 11.7.4,
11.6.0.4 and 11.2.12.11. (CVE-2026-55953)
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{
"release": "18.04",
"pkgs": [
{"reference": "erlang"},
{"reference": "erlang-asn1"},
{"reference": "erlang-base"},
{"reference": "erlang-base-hipe"},
{"reference": "erlang-common-test"},
{"reference": "erlang-corba"},
{"reference": "erlang-crypto"},
{"reference": "erlang-debugger"},
{"reference": "erlang-dev"},
{"reference": "erlang-dialyzer"},
{"reference": "erlang-diameter"},
{"reference": "erlang-doc"},
{"reference": "erlang-edoc"},
{"reference": "erlang-eldap"},
{"reference": "erlang-erl-docgen"},
{"reference": "erlang-et"},
{"reference": "erlang-eunit"},
{"reference": "erlang-examples"},
{"reference": "erlang-ic"},
{"reference": "erlang-ic-java"},
{"reference": "erlang-inets"},
{"reference": "erlang-jinterface"},
{"reference": "erlang-manpages"},
{"reference": "erlang-megaco"},
{"reference": "erlang-mnesia"},
{"reference": "erlang-mode"},
{"reference": "erlang-nox"},
{"reference": "erlang-observer"},
{"reference": "erlang-odbc"},
{"reference": "erlang-os-mon"},
{"reference": "erlang-parsetools"},
{"reference": "erlang-public-key"},
{"reference": "erlang-reltool"},
{"reference": "erlang-runtime-tools"},
{"reference": "erlang-snmp"},
{"reference": "erlang-src"},
{"reference": "erlang-ssh"},
{"reference": "erlang-ssl"},
{"reference": "erlang-syntax-tools"},
{"reference": "erlang-tools"},
{"reference": "erlang-wx"},
{"reference": "erlang-x11"},
{"reference": "erlang-xmerl"}
]
}
]
}
};
var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
var third_party_vendors = distro_constraints_values['third_party'];
if (!empty_or_null(third_party_vendors)) {
var vendor;
foreach vendor (third_party_vendors) {
if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
}
}
}
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);
if (!empty_or_null(report))
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : report
);
exit(0);
}
else
{
audit(AUDIT_HOST_NOT, 'affected');
}
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28 Jul 2026 00:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 49.1
EPSS0.00245
SSVC