6.3

CVE-2026-54891: erlang erlang\/otp

CVSS: 6.3v4.0MediumModified
AliasesUBUNTU-CVE-2026-54891DEBIAN-CVE-2026-54891
Published 02-07-2026Last modified 08-09-2026
Open JSON

Vulnerability summary

CVE-2026-54891 is a medium (CVSS 6.3) vulnerability in erlang erlang\/otp. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.6% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.14%
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. 08-09-2026
    Last modifiedVulnerability information updated.

Description

Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability in Erlang/OTP ssl (tls_gen_connection module) allows a network-positioned attacker to inject unauthenticated plaintext that the TLS client application later treats as authenticated server data. The function tls_gen_connection:handle_protocol_record/3 rejects APPLICATION_DATA records that arrive in pre-handshake states when the TLS endpoint acts as a server, but does not apply the same check when the endpoint acts as a client. A network-positioned attacker can send plaintext APPLICATION_DATA records to the client during the handshake. The records are buffered and, once the handshake completes successfully, delivered to the application as if they were authenticated post-handshake data. The attacker cannot observe the client's response or steer the connection, so the impact is limited to blind injection of unauthenticated bytes. The injection window is wider for TLS versions prior to TLS 1.3 than for TLS 1.3. This vulnerability is associated with program file lib/ssl/src/tls_gen_connection.erl. TLS 1.3 is affected starting with OTP 22.0, when TLS 1.3 support was added. This issue affects OTP from OTP 17.0 before OTP 27.3.4.14, from OTP 28.0 before OTP 28.5.0.3, and from OTP 29.0 before OTP 29.0.3, corresponding to ssl from 5.3.4 before 11.2.12.10, from 11.3 before 11.6.0.3, and from 11.7 before 11.7.3. Whether OTP before OTP 17.0, corresponding to ssl before 5.3.4, is affected is unknown.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

0.00 pp

From 0.14% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.14%

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≥ 17.0, < 27.3.4.14 | ≥ 28.0, < 28.5.0.3 | ≥ 29.0, < 29.0.3
  • erlang\/ssl≥ 5.3.4, < 11.2.12.10 | ≥ 11.3, < 11.6.0.3 | ≥ 11.7, < 11.7.3
  • otp≥ 17.0, < 27.3.4.14 | ≥ 28.0, < 28.5.0.3 | ≥ 29.0, < 29.0.3 | ≥ 5.3.4, < 11.2.12.10 | ≥ 11.3, < 11.6.0.3 | ≥ 11.7, < 11.7.3 | ≥ 84adefa331c4159d432d22840663c38f155cd4c1, < 07d2d0e93f6aaf7652a81e8df075fc1728da5e96
Debian1 product
  • erlangAll versions (No fix recorded) | < 1:27.3.4.1+dfsg-1+deb13u3 | < 1:29.0.3+dfsg-1
Ubuntu1 product
  • erlang< 1:16.b.3-dfsg-1ubuntu2.2+esm3 | < 1:18.3-dfsg-1ubuntu3.1+esm4 | < 1:20.2.2+dfsg-1ubuntu2+esm4 | < 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

9 links