CVE-2026-75538: A Signed Length Overflow in Erlang/OTP's inet TCP Driver Overflows the Receive Buffer Into BEAM VM Memory From an Unauthenticated Peer

unknownCVE-2026-75538

CSIRTS triage

vendor: Erlang/OTP product: Erlang/OTP Memory corruption

What: Signed length overflow in the inet TCP driver allows an unauthenticated remote peer to overflow the receive buffer into BEAM VM memory.
Who is affected: Any system running Erlang/OTP with exposed TCP services accepting connections from untrusted peers.
Urgency: Critical urgency as remote unauthenticated peers can trigger memory corruption.
Action: Update Erlang/OTP to a patched version addressing CVE-2026-75538.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-09-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-75538

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-755380.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-75538	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for A Signed Length

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-75538: An attacker that connects to an open Erlang TCP port that uses the inet driver with {packet,4}…nvd · 2026-09-01
unknownCVE-2026-72326: In the Linux kernel, the following vulnerability has been resolved: net/sched: cake: reject ov…nvd · 2026-08-15
unknownCVE-2026-63384: Libevent: `evtag_unmarshal_header()` decodes a wire `uint32` length into a signed `int` return…msrc · 2026-08-11
criticalCVE-2026-64102: In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Reject MPA FPDU …nvd · 2026-07-19
mediumGHSA-mjqx-c6f6-7rc2: mint: Content-Length header accepts non-RFC "+" sign prefixghsa · 2026-07-09