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CVE-2026-55737: CWE-195 Signed to Unsigned Conversion Error in Erlang OTP

0
Medium
VulnerabilityCVE-2026-55737cvecve-2026-55737cwe-195cwe-787
Published: 07/27/2026 (07/27/2026, 15:13:54 UTC)
Source: CVE Database V5
Vendor/Project: Erlang
Product: OTP

Description

Signed to Unsigned Conversion Error and Out-of-bounds Write vulnerability in Erlang OTP erts allows an attacker who can supply a crafted Erlang external term format (ETF) binary to binary_to_term/1 to corrupt the BEAM heap pointer and crash the virtual machine. When decoding a LARGE_TUPLE_EXT term, the validation pass decoded_size() in erts/emulator/beam/external.c reads the 32-bit arity field as unsigned (get_uint32()), while the decode pass dec_term() reads the same field as a signed 32-bit integer (get_int32()) into an int. An arity wire value of 0x80000000 passes validation as 2147483648 but decodes as -2147483648, so the subsequent hp += n moves the heap allocation pointer backward. Neither pass enforces the runtime tuple-arity limit MAX_ARITYVAL. The result is an out-of-bounds heap write; in practice the VM detects an impossible heap size and aborts, denying service. The required padding is large when uncompressed but the compressed-ETF envelope shrinks it to a small payload on the wire. This issue affects OTP from OTP 25.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to erts from 13.0 before 17.0.4, 16.4.0.4 and 15.2.7.11.

CVSS v4.0

Score 5.1medium

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
None
Vuln. Integrity
None
Vuln. Availability
Low
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected software

GitHub Actionsmore threats →cve
erts
pkg:github/erts
Affected versions
=13.0
GitHub Actionsmore threats →cve
erlang/otp
pkg:github/erlang/otp
Affected versions
=25.0
CPE configurations
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Data Version
5.2
Assigner Short Name
EEF
Date Reserved
2026-06-17T10:44:34.365Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a677b469c2644c7f851287b

Added to database: 07/27/2026, 15:37:42 UTC

Last updated: 07/27/2026, 16:28:04 UTC

Views: 6

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