8.2

CVE-2026-55952: erlang erlang\/otp

CVSS: 8.2v4.0HighModified
AliasesUBUNTU-CVE-2026-55952DEBIAN-CVE-2026-55952
Published 02-07-2026Last modified 24-07-2026
Open JSON

Vulnerability summary

CVE-2026-55952 is a high (CVSS 8.2) vulnerability in erlang erlang\/otp. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.48%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 7 · Related 5
MGASA-2026-0457OPENSUSE-SU-2026:11559-1OPENSUSE-SU-2026:11560-1RHSA-2026:63160SUSE-SU-2026:3579-1SUSE-SU-2026:3645-1

Timeline

  1. 02-07-2026
    PublishedVulnerability first disclosed.
  2. 24-07-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

0.00 pp

From 0.48% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.48%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Erlang3 products
  • erlang\/otp≥ 22.2, < 27.3.4.14 | ≥ 28.0, < 28.5.0.3 | ≥ 29.0, < 29.0.3
  • erlang\/ssl≥ 9.5, < 11.2.12.10 | ≥ 11.3, < 11.6.0.3 | ≥ 11.7, < 11.7.3
  • otp≥ 9.5 (No fix recorded) | ≥ 22.2 (No fix recorded) | ≥ 339a279f02ce38a7b23010e56000613e19abb21f (No fix recorded)
Debian1 product
  • erlangAll versions (No fix recorded) | < 1:27.3.4.1+dfsg-1+deb13u3 | < 1:29.0.3+dfsg-1
Ubuntu1 product
  • erlang< 1:22.2.7+dfsg-1ubuntu0.5+esm3 | < 1:24.2.1+dfsg-1ubuntu0.8 | < 1:25.3.2.8+dfsg-1ubuntu4.8 | All versions (No fix recorded) | < 1:27.3.4.6+dfsg-1ubuntu0.2

3 vendors · 5 products

References

12 links
Show all 12 references