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TI-2026-52886 Aliases CVE-2026-75538

Heap-based buffer overflow in Erlang OTP

Priority LOW 37CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 4 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00854 58th percentileScored 2026-11-07
Fix Partial OTP (Erlang): 27.3.4.17, 28.5.0.6, 29.0.6 +3Red Hat: 1 advisoryRed Hat: 1 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ErlangOTP17.0 to before 27.3.4.17; 28.0 to before 28.5.0.6; 29.0 to before 29.0.627.3.4.17, 28.5.0.6, 29.0.6Patch availableCNA
ErlangOTP6.0 to before 15.2.7.13; 16.0 to before 16.4.0.6; 17.0 to before 17.0.615.2.7.13, 16.4.0.6, 17.0.6Patch availableCNA
  • OTP VendorErlang Affected 17.0 to before 27.3.4.17; 28.0 to before 28.5.0.6; 29.0 to before 29.0.6 Fixed in 27.3.4.17, 28.5.0.6, 29.0.6 Patch available CNA
  • OTP VendorErlang Affected 6.0 to before 15.2.7.13; 16.0 to before 16.4.0.6; 17.0 to before 17.0.6 Fixed in 15.2.7.13, 16.4.0.6, 17.0.6 Patch available CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*——Erlang
  • cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* Versions — — ·Erlang

Remediation

  • Fix · CNA OTP (Erlang) Fixed in 27.3.4.17, 28.5.0.6, 29.0.6
  • Fix · CNA OTP (Erlang) Fixed in 15.2.7.13, 16.4.0.6, 17.0.6

Red Hat 1 advisory

  • RHSA-2026:63160 Released 2026-09-03 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images erlang27-27.3.4.17-1.hum1@aarch64, erlang27-27.3.4.17-1.hum1@src, erlang27-27.3.4.17-1.hum1@x86_64 +47

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Erlang OTP 17.0, 27.3.4.17 and 2 more versions

    11 records Highest priority Priority MEDIUM 2 MEDIUM, 9 LOW

    Other records, highest priority first

    • TI-2026-50021 httpd applies no timeout while receiving a request body, parking a worker on a stalled clientPriority MEDIUM 45
    • TI-2026-52570 inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body ReceptionPriority MEDIUM 44
    • TI-2026-47459 httpd mod_auth directory protection bypassed by a doubled slash in the request pathPriority LOW 38
    Show all 11 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix yet
Red Hat OpenStack Platform 16.2AffectedNo fix yet
Red Hat OpenStack Platform 17.1AffectedNo fix yet
Red Hat OpenStack Platform 18.0AffectedNo fix yet
Red Hat Hardened ImagesFixed RHSA-2026:63160

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-75538

References

Patch 1

Advisory 1

Other 2

  • TI-2025-23504 Erlang/OTP SSH Vulnerable to Pre-Authentication RCE KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-48954 httpd parks a request worker indefinitely on a malformed chunk size sent after the headers CVSS 4.0HIGH 8.7
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2026-71037 Path traversal in rebar3 via unvalidated dependency app names CVSS 4.0HIGH 7.5
  • TI-2024-36042 ssl fails to validate incorrect extened key usage CVSS 3.1MEDIUM 5.5
  • TI-2020-10791 Rebar3 versions 3.0.0-beta.3 to 3.13.2 are vulnerable to OS command injection via URL… CVSS 3.1CRITICAL 9.8
See all 80 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences