CVE-2026-55737

VM crash via signed tuple arity decoding

Published Jul 27, 2026 · Updated Jul 27, 2026

Out-of-bounds write in Erlang/OTP erts allows attackers to crash the BEAM virtual machine through a crafted ETF binary. The decoded_size validation pass reads LARGE_TUPLE_EXT arity as unsigned, but dec_term reads it as signed and moves the heap pointer backward. Reachability requires an application or local caller to pass attacker-controlled ETF to binary_to_term/1; the bounded result is VM abort and service interruption.

CVSS severity5.1
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Erlang/OTP erts allows attackers to crash the BEAM virtual machine through a crafted ETF binary. The decoded_size validation pass reads LARGE_TUPLE_EXT arity as unsigned, but dec_term reads it as signed and moves the heap pointer backward. Reachability requires an application or local caller to pass attacker-controlled ETF to binary_to_term/1; the bounded result is VM abort and service interruption.

The record

CVE
CVE-2026-55737
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Erlang
Product
Erlang/OTP
Classifications
CWE-787, CWE-195, CAPEC-92, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.0 <* changes=[{"at":"17.0.4","status":"unaffected"},{"at":"16.4.0.4","status":"unaffected"},{"at":"15.2.7.11","status":"unaffected"}]
  2. Affected versionversion=25.0 <* changes=[{"at":"29.0.4","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"27.3.4.15","status":"unaffected"}]
  3. Affected versionversion=ebcbb97b4ec223464cac3d94375739a248ddef6e <c5210b42a9d3d96f3d25601942ce8122be0f3761

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Erlang · Erlang/OTPversion=13.0 <* changes=[{"at":"17.0.4","status":"unaffected"},{"at":"16.4.0.4","status":"unaffected"},{"at":"15.2.7.11","status":"unaffected"}]; version=25.0 <* changes=[{"at":"29.0.4","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"27.3.4.15","status":"unaffected"}]; version=ebcbb97b4ec223464cac3d94375739a248ddef6e <c5210b42a9d3d96f3d25601942ce8122be0f3761

Published CVSS scores

5.1Erlang Ecosystem FoundationCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-195Signed to Unsigned Conversion Error
CAPEC-92Forced Integer Overflow
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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