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Otp EUVDEUVD-2026-49321

| CVE-2026-55737 MEDIUM
Signed to Unsigned Conversion Error (CWE-195)
2026-07-27 EEF
Buffer Overflow HP Otp Erlang
5.1
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
5.1 MEDIUM
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/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
SUSE
4.0 MEDIUM
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Jul 27, 2026 - 15:51 vuln.today
Analysis Generated
Jul 27, 2026 - 15:51 vuln.today

DescriptionCVE.org

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 27.3.4.15, 28.5.0.4, and 29.0.4 corresponding to erts from 13.0 before 15.2.7.11, 16.4.0.4, and 17.0.4.

AnalysisAI

Out-of-bounds heap write in Erlang OTP's binary_to_term/1 function causes virtual machine crash via a maliciously crafted Erlang external term format (ETF) binary. The vulnerability, triggered by a signed/unsigned conversion error in LARGE_TUPLE_EXT decoding, affects OTP 25.0 through 27.3.4.14, 28.5.0.3, and 29.0.3. No authentication is required, and exploitation leads to denial of service; no public exploit code has been identified at time of analysis.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-49321 vulnerability details – vuln.today
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