High

Stack-based Buffer Overflow in Erlang/OTP inet_drv SCTP ERROR Chunk Parsing

IdentifiersCVE-2026-49759CWE-121· Stack-based Buffer Overflow

CVE-2026-49759 is a stack-based buffer overflow in Erlang/OTP's erts inet_drv component, specifically in the sctp_parse_error_chunk function in erts/emulator/drivers/common/inet_drv.c. The function parses SCTP ERROR chunks and writes SCTP cause codes into a fixed-size, stack-allocated ErlDrvTermData spec[] array without proper bounds checking. An unauthenticated remote attacker who has established an SCTP association to a reachable listening SCTP port can send a single crafted SCTP ERROR chunk containing enough cause codes to overflow the stack buffer and crash the BEAM VM. The overwrite is constrained to 16-bit values interleaved with a fixed tag, which limits exploitability and prevents a controlled return-address overwrite according to the advisory. The crafted chunk may also cause limited disclosure of Erlang VM memory fragments in the resulting error packet observed by the Erlang process. Affected versions are OTP 17.0 before 27.3.4.13, 28.5.0.2, and 29.0.2, corresponding to erts 6.0 before 15.2.7.9, 16.4.0.2, and 17.0.2.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

The primary impact is remote denial of service: a network attacker can crash the BEAM VM by triggering a stack overflow in SCTP error-cause parsing. The available information indicates exploitation does not yield reliable code execution because the attacker can only influence limited 16-bit values interleaved with a fixed tag, preventing controlled overwrite of the return address. A secondary impact is limited information disclosure, where fragments of Erlang VM memory may be reflected into an error packet visible to the Erlang process; the advisory states the disclosure scope is limited because the leaked data is already readable by the user running the VM.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce or eliminate exposure of SCTP services. Disable or avoid SCTP where operationally feasible, ensure affected Erlang applications do not expose reachable listening SCTP sockets via gen_sctp using the default inet backend, and restrict network access to SCTP listeners with filtering or segmentation so untrusted hosts cannot establish SCTP associations. Windows builds are unaffected because SCTP is not supported on Windows.

Remediation

Patch, then assume compromise.

Upgrade Erlang/OTP to a fixed release. The issue is fixed in OTP 27.3.4.13, 28.5.0.2, and 29.0.2; corresponding fixed erts versions are 15.2.7.9, 16.4.0.2, and 17.0.2. For downstream distributions such as Mariner, apply the vendor-provided security update that incorporates the upstream fix. A remediation commit is referenced in the advisory: 3983d495284331c121f600a80bac9fcf4e16381e.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

ErlangErlang/Otpapplication

ErlangErtsapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

osvNews

Jun 10, 2026

EEF-CVE-2026-49759 - OSV

A stack-based buffer overflow in Erlang OTP erts inet_drv SCTP error cause parsing that allows an unauthenticated remote attacker to crash the BEAM VM, resulting in denial of service.

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

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