8.2

CVE-2026-55952

TLS 1.3 server denial of service via malformed ClientHello pre-shared key extension

The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process.

An unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected.

This issue affects OTP from 22.2 before 29.0.3, 28.5.0.3 and 27.3.4.14 corresponding to ssl from 9.5 before 11.7.3, 11.6.0.3 and 11.2.12.10.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Erlang ≫ Erlang/otp Version >= 22.2 < 27.3.4.14
Erlang ≫ Erlang/otp Version >= 28.0 < 28.5.0.3
Erlang ≫ Erlang/otp Version >= 29.0 < 29.0.3
Erlang ≫ Erlang/ssl Version >= 9.5 < 11.2.12.10
Erlang ≫ Erlang/ssl Version >= 11.3 < 11.6.0.3
Erlang ≫ Erlang/ssl Version >= 11.7 < 11.7.3
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.49% 0.384
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6b3ad84c-e1a6-4bf7-a703-f496b71e49db 8.2 0 0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-1284 Improper Validation of Specified Quantity in Input

The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.

https://www.erlang.org/doc/system/versions.html#order-of-versions
Release Notes
https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce
Patch
https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff
Patch
https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662
Patch
https://cna.erlef.org/cves/CVE-2026-55952.html
Vendor Advisory
Mitigation
https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59
Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-55952
Third Party Advisory
Mitigation