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Vulnerabilities

Vulnerability · CVE-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 equal length…

Published Jul 2, 2026 · catalog updated Nov 11, 2026 · the affected product

Last checked Nov 11, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-55952. EPSS is 0.48%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.48%
Remediation
Version ranges on file
Affected products
cpe erlang/erlang/otp · cpe erlang/erlang/ssl

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 27.3.4.14, OTP 28.5.0.3, and OTP 29.0.3, corresponding to ssl from 9.5 before 11.2.12.10, 11.6.0.3, and 11.7.3.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe erlang/erlang/otp< 27.3.4.14
  • cpe erlang/erlang/otp< 28.5.0.3
  • cpe erlang/erlang/otp< 29.0.3
  • cpe erlang/erlang/ssl< 11.2.12.10
  • cpe erlang/erlang/ssl< 11.6.0.3
  • cpe erlang/erlang/ssl< 11.7.3

How to fix CVE-2026-55952

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-55952. EPSS is 0.48%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with < 27.3.4.14, < 28.5.0.3, < 29.0.3, < 11.2.12.10, < 11.6.0.3, < 11.7.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1284. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 11, 2026 · NIST NVD

    Updated

    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:us

  2. Nov 11, 2026 · OpenCVE

    Detected

    CVE-2026-55952 is named on the public OpenCVE page.

Sources

  • CVE.orgVulnerability recordCVE-2026-55952

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-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 equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSh

    nvd.nist.gov
  • OpenCVEVendor advisoryCVE-2026-55952

    CVE-2026-55952 is named on the public OpenCVE page.

    opencve.io

References

Freshness

Last verified in this catalog Nov 11, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 11, 2026
  • NIST NVDNov 11, 2026
  • OpenCVENov 11, 2026