CVE-2026-59250Network attack vector

Remote code execution via unchecked property-name formatting

Published Jul 27, 2026 · Updated Jul 27, 2026

Classic buffer overflow in Erlang/OTP allows remote attackers to crash the BEAM VM or execute code through a crafted Megaco message. The mfs_load_property_groups routine passes an oversized property parm name to sprintf, overflowing a fixed 512-byte error_msg field and corrupting adjacent live pointers and counters. Network access to a node configured with the flex scanner is required; fortified builds abort, while unfortified builds expose memory corruption.

CVSS severity8.3
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in Erlang/OTP allows remote attackers to crash the BEAM VM or execute code through a crafted Megaco message. The mfs_load_property_groups routine passes an oversized property parm name to sprintf, overflowing a fixed 512-byte error_msg field and corrupting adjacent live pointers and counters. Network access to a node configured with the flex scanner is required; fortified builds abort, while unfortified builds expose memory corruption.

The record

CVE
CVE-2026-59250
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Erlang
Product
Erlang/OTP
Classifications
CWE-120, CWE-787, CAPEC-100, T1190
Attack vector
network
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=3.17.1 <* changes=[{"at":"4.9.1","status":"unaffected"},{"at":"4.8.3.1","status":"unaffected"},{"at":"4.7.2.2","status":"unaffected"}]
  2. Affected versionversion=84adefa331c4159d432d22840663c38f155cd4c1 <8704c8f550a11ed5f825e3c011ecb03565b79c4f
  3. Affected versionversion=R13B03 <* changes=[{"at":"29.0.4","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"27.3.4.15","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Erlang · Erlang/OTPversion=3.17.1 <* changes=[{"at":"4.9.1","status":"unaffected"},{"at":"4.8.3.1","status":"unaffected"},{"at":"4.7.2.2","status":"unaffected"}]; version=84adefa331c4159d432d22840663c38f155cd4c1 <8704c8f550a11ed5f825e3c011ecb03565b79c4f; version=R13B03 <* changes=[{"at":"29.0.4","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"27.3.4.15","status":"unaffected"}]

Published CVSS scores

8.3Erlang Ecosystem FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787Out-of-bounds Write
CAPEC-100Overflow Buffers
T1190Exploit Public-Facing Application

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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