CVE-2026-55952
published 2026-07-02CVE-2026-55952: 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…
PriorityP343high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.48%
39.6th percentile
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 OTP 22.2 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 9.5 before 11.7.3, 11.6.0.3 and 11.2.12.10.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | erlang | — | — |
| erlang | erlang_otp | >= 22.2 < 27.3.4.14 | 27.3.4.14 |
| erlang | erlang_otp | >= 28.0 < 28.5.0.3 | 28.5.0.3 |
| erlang | erlang_otp | >= 29.0 < 29.0.3 | 29.0.3 |
| erlang | erlang_ssl | >= 11.3 < 11.6.0.3 | 11.6.0.3 |
| erlang | erlang_ssl | >= 11.7 < 11.7.3 | 11.7.3 |
| erlang | erlang_ssl | >= 9.5 < 11.2.12.10 | 11.2.12.10 |
| erlang | otp | >= 22.2 < * | * |
| erlang | otp | >= 339a279f02ce38a7b23010e56000613e19abb21f < * | * |
| erlang | otp | >= 9.5 < * | * |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.08.2HIGHCVSS: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
vendor_redhat8.2HIGH
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Red Hat
erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling
vendor_redhat·2026-07-02·CVSS 8.2
CVE-2026-55952 [HIGH] CWE-130 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling
erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling
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
VulDB
Erlang OTP up to 29.0.2 ClientHello improper validation of specified quantity in input (EUVD-2026-41412)
vuldb·2026-07-02·CVSS 8.2
CVE-2026-55952 [HIGH] Erlang OTP up to 29.0.2 ClientHello improper validation of specified quantity in input (EUVD-2026-41412)
A vulnerability was found in Erlang OTP up to 29.0.2. It has been classified as critical. The affected element is an unknown function of the component ClientHello Handler. Performing a manipulation results in improper validation of specified quantity in input.
This vulnerability is known as CVE-2026-55952. Remote exploitation of the attack is possible. No exploit is available.
Upgrading the affected component is recommended.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling [epel-all]
bugzilla·2026-07-03·CVSS 8.2
CVE-2026-55952 [HIGH] CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling [epel-all]
CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling [fedora-all]
bugzilla·2026-07-03·CVSS 8.2
CVE-2026-55952 [HIGH] CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling [fedora-all]
CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 unauthenticate
Bugzilla
CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling
bugzilla·2026-07-02·CVSS 8.2
CVE-2026-55952 [HIGH] CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling
CVE-2026-55952 erlang: Erlang/OTP: Denial of Service in TLS 1.3 session ticket handling
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 su
https://cna.erlef.org/cves/CVE-2026-55952.htmlhttps://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadffhttps://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3cehttps://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59https://osv.dev/vulnerability/EEF-CVE-2026-55952https://www.erlang.org/doc/system/versions.html#order-of-versions
2026-07-02
Published