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Fencer Vulns
high 8.2

CVE-2026-75538 json

A Signed Length Overflow in Erlang/OTP's inet TCP Driver Overflows the Receive Buffer Into BEAM VM Memory From an Unauthenticated Peer

published 2026-09-01 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-69242

cvss
8.2
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

An attacker that connects to an open Erlang TCP port that uses the inet driver with {packet,4} mode can use a signed overflow in an incorrect packet length calculation to overflow the receive buffer into the VM allocator area and beyond up to about 2 GB.

This would easily trash the allocated block's allocator metadata footer, and the next block, if any, and most likely cause the BEAM VM to crash. Utilizing this with precision enough to achieve Remote Code Execution would be extremely unfeasible.

This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to erts from 6.0 before 15.2.7.13, from 16.0 before 16.4.0.6, and from 17.0 before 17.0.6. Whether OTP before OTP 17.0, corresponding to erts before 6.0, is affected is unknown.

Patch / fix

  • Erlang OTP 15.2.7.13, 16.4.0.6, 17.0.6, 27.3.4.17, 28.5.0.6, 29.0.6
  • erlang Debian 13 1:27.3.4.1+dfsg-1+deb13u4
  • erlang Debian 14 1:29.0.6+dfsg-1

debian advisories DEBIAN-CVE-2026-75538

  • erlang Ubuntu 22.04 LTS 1:24.2.1+dfsg-1ubuntu0.7
  • erlang Ubuntu 24.04 LTS 1:25.3.2.8+dfsg-1ubuntu4.7
  • erlang Ubuntu 26.04 LTS 1:27.3.4.6+dfsg-1ubuntu0.1
  • erlang Ubuntu Pro 14.04 LTS 1:16.b.3-dfsg-1ubuntu2.2+esm2
  • erlang Ubuntu Pro 16.04 LTS 1:18.3-dfsg-1ubuntu3.1+esm3
  • erlang Ubuntu Pro 18.04 LTS 1:20.2.2+dfsg-1ubuntu2+esm3
  • erlang Ubuntu Pro 20.04 LTS 1:22.2.7+dfsg-1ubuntu0.5+esm2

ubuntu advisories UBUNTU-CVE-2026-75538

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • erlang27 hummingbird 1 27.3.4.17-1.hum1
  • erlang27-et hummingbird 1 27.3.4.17-1.hum1
  • erlang27-wx hummingbird 1 27.3.4.17-1.hum1
  • erlang27-ftp hummingbird 1 27.3.4.17-1.hum1
  • erlang27-ssh hummingbird 1 27.3.4.17-1.hum1
  • erlang27-ssl hummingbird 1 27.3.4.17-1.hum1
  • erlang27-asn1 hummingbird 1 27.3.4.17-1.hum1
  • erlang27-edoc hummingbird 1 27.3.4.17-1.hum1

red hat advisories RHSA-2026:63160

  • erlang Azure Linux 3.0 26.2.5.21-6

azure linux advisories AZL-98499

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-75538 updated cvss 7.5

erlang: Erlang/OTP: Remote denial of service via signed length overflow in TCP driver

  • Red Hat OpenStack Platform 13 (Queens) erlang, erlang-ic, erlang-ftp, erlang-ose, erlang-ssh, erlang-ssl, +36 more Red Hat OpenStack Platform 16.2 erlang, erlang-ssl, erlang-asn1, erlang-erts, erlang-hipe, erlang-sasl, +15 more Red Hat OpenStack Platform 17.1 erlang, erlang-ssl, erlang-asn1, erlang-erts, erlang-sasl, erlang-snmp, +14 more Red Hat OpenStack Platform 18.0 erlang
    affected: no fix available
  • Red Hat Hardened Images erlang27 27.3.4.17-1.hum1, erlang27-et 27.3.4.17-1.hum1, erlang27-wx 27.3.4.17-1.hum1, erlang27-ftp 27.3.4.17-1.hum1, erlang27-ssh 27.3.4.17-1.hum1, erlang27-ssl 27.3.4.17-1.hum1, +33 more
    fixed: vendor fix RHSA-2026:63160

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 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
CNA 4.0 8.2 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

Affected products

  • Erlang OTP

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.