CVE-2026-59250 (GCVE-0-2026-59250)
Vulnerability from cvelistv5 – Published: 2026-07-27 15:25 – Updated: 2026-09-08 01:07
VLAI
EPSS
VEX
Title
Megaco flex scanner buffer overflow via oversized property parm name
Summary
Classic buffer overflow in the Erlang/OTP megaco flex scanner C driver allows a remote unauthenticated attacker to corrupt the driver's memory (and potentially achieve remote code execution or a denial-of-service crash) by sending a single text-encoded H.248/Megaco message containing an oversized property parm name.
When tokenizing a Local/Remote descriptor, mfs_load_property_groups extracts the attacker-controlled property name (bounded only by the message length) and, when no value follows, formats it into a fixed 512-byte error_msg field of the MfsErlDrvData struct using an unchecked sprintf call. Names longer than roughly 452 bytes overflow into the immediately following struct fields (text_buf, text_ptr, term_spec, term_spec_size, term_spec_index), overwriting live pointers and counters with attacker-chosen bytes. Subsequent scanner code writes and frees through the corrupted pointers, producing arbitrary write and arbitrary free primitives inside the BEAM VM process, which can be leveraged for remote code execution. On builds compiled with _FORTIFY_SOURCE the overflow is detected at runtime and terminates the process with SIGABRT, resulting in denial of service.
The overflow occurs in the flex scanner before any grammar or Megaco-level authentication processing, so exploitation requires only network reachability to the megaco transport port on a node configured with {scanner, flex}.
This vulnerability is associated with program files lib/megaco/src/flex/megaco_flex_scanner_drv.flex.src and program routines mfs_load_property_groups.
This issue affects OTP from OTP 17.0 before OTP 27.3.4.15, from OTP 28.0 before OTP 28.5.0.4, and from OTP 29.0 before OTP 29.0.4, corresponding to megaco from 3.17.1 before 4.7.2.2, from 4.8 before 4.8.3.1, and from 4.9 before 4.9.1. Whether OTP before OTP 17.0, corresponding to megaco before 3.17.1, is affected is unknown.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 18:33 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-59250.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-59250 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/commit/8704c8f550a1… | patch |
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Erlang | OTP |
Unknown:
0 , < 17.0
(otp)
Affected: 17.0 , < 27.3.4.15 (otp) Affected: 28.0 , < 28.5.0.4 (otp) Affected: 29.0 , < 29.0.4 (otp) cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
||
| Erlang | OTP |
Unknown:
0 , < 3.17.1
(otp)
Affected: 3.17.1 , < 4.7.2.2 (otp) Affected: 4.8 , < 4.8.3.1 (otp) Affected: 4.9 , < 4.9.1 (otp) cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
||
| Erlang | OTP |
Affected:
84adefa331c4159d432d22840663c38f155cd4c1 , < 8704c8f550a11ed5f825e3c011ecb03565b79c4f
(git)
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
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"value": "Classic buffer overflow in the Erlang/OTP megaco flex scanner C driver allows a remote unauthenticated attacker to corrupt the driver\u0027s memory (and potentially achieve remote code execution or a denial-of-service crash) by sending a single text-encoded H.248/Megaco message containing an oversized property parm name.\n\nWhen tokenizing a Local/Remote descriptor, mfs_load_property_groups extracts the attacker-controlled property name (bounded only by the message length) and, when no value follows, formats it into a fixed 512-byte error_msg field of the MfsErlDrvData struct using an unchecked sprintf call. Names longer than roughly 452 bytes overflow into the immediately following struct fields (text_buf, text_ptr, term_spec, term_spec_size, term_spec_index), overwriting live pointers and counters with attacker-chosen bytes. Subsequent scanner code writes and frees through the corrupted pointers, producing arbitrary write and arbitrary free primitives inside the BEAM VM process, which can be leveraged for remote code execution. On builds compiled with _FORTIFY_SOURCE the overflow is detected at runtime and terminates the process with SIGABRT, resulting in denial of service.\n\nThe overflow occurs in the flex scanner before any grammar or Megaco-level authentication processing, so exploitation requires only network reachability to the megaco transport port on a node configured with {scanner, flex}.\n\nThis vulnerability is associated with program files lib/megaco/src/flex/megaco_flex_scanner_drv.flex.src and program routines mfs_load_property_groups.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, from OTP\u00a028.0 before OTP\u00a028.5.0.4, and from OTP\u00a029.0 before OTP\u00a029.0.4, corresponding to megaco from 3.17.1 before 4.7.2.2, from 4.8 before 4.8.3.1, and from 4.9 before 4.9.1. Whether OTP before OTP\u00a017.0, corresponding to megaco before 3.17.1, is affected is unknown."
},
{
"lang": "es",
"value": "Cl\u00e1sico desbordamiento de b\u00fafer en el controlador C del esc\u00e1ner flex megaco de Erlang/OTP permite a un atacante remoto no autenticado corromper la memoria del controlador (y potencialmente lograr la ejecuci\u00f3n remota de c\u00f3digo o un fallo por denegaci\u00f3n de servicio) enviando un \u00fanico mensaje H.248/Megaco codificado en texto que contiene un nombre de par\u00e1metro de propiedad sobredimensionado.\n\nAl tokenizar un descriptor Local/Remoto, mfs_load_property_groups extrae el nombre de propiedad controlado por el atacante (limitado solo por la longitud del mensaje) y, cuando no le sigue ning\u00fan valor, lo formatea en un campo error_msg fijo de 512 bytes de la estructura MfsErlDrvData utilizando una llamada sprintf sin verificar. Nombres de m\u00e1s de aproximadamente 452 bytes desbordan los campos de la estructura inmediatamente siguientes (text_buf, text_ptr, term_spec, term_spec_size, term_spec_index), sobrescribiendo punteros y contadores activos con bytes elegidos por el atacante. El c\u00f3digo del esc\u00e1ner posterior escribe y libera a trav\u00e9s de los punteros corruptos, produciendo primitivas de escritura arbitraria y liberaci\u00f3n arbitraria dentro del proceso de la VM BEAM, que pueden ser aprovechadas para la ejecuci\u00f3n remota de c\u00f3digo. En compilaciones con _FORTIFY_SOURCE, el desbordamiento se detecta en tiempo de ejecuci\u00f3n y termina el proceso con SIGABRT, lo que resulta en denegaci\u00f3n de servicio.\n\nEl desbordamiento ocurre en el esc\u00e1ner flex antes de cualquier procesamiento de gram\u00e1tica o autenticaci\u00f3n a nivel Megaco, por lo que la explotaci\u00f3n requiere solo accesibilidad de red al puerto de transporte megaco en un nodo configurado con {scanner, flex}.\n\nEsta vulnerabilidad est\u00e1 asociada con los archivos de programa lib/megaco/src/flex/megaco_flex_scanner_drv.flex.src y las rutinas de programa mfs_load_property_groups.\n\nEste problema afecta a OTP desde OTP 17.0 antes de OTP 29.0.4, OTP 28.5.0.4 y OTP 27.3.4.15, lo que corresponde a megaco desde 3.17.1 antes de 4.9.1, 4.8.3.1 y 4.7.2.2. Las versiones anteriores a OTP 17.0 tambi\u00e9n est\u00e1n afectadas, pero no se enumeran porque el esquema de versiones de OTP solo se define a partir de OTP 17.0 en adelante."
}
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"title": "megaco: Erlang/OTP Megaco Flex Scanner: Remote code execution or denial of service via oversized message",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59250.json",
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"value": "\u003cp\u003eClassic buffer overflow in the Erlang/OTP megaco flex scanner C driver allows a remote unauthenticated attacker to corrupt the driver\u0027s memory (and potentially achieve remote code execution or a denial-of-service crash) by sending a single text-encoded H.248/Megaco message containing an oversized property parm name.\u003c/p\u003e\n\u003cp\u003eWhen tokenizing a Local/Remote descriptor, \u003ccode\u003emfs_load_property_groups\u003c/code\u003e extracts the attacker-controlled property name (bounded only by the message length) and, when no value follows, formats it into a fixed 512-byte \u003ccode\u003eerror_msg\u003c/code\u003e field of the \u003ccode\u003eMfsErlDrvData\u003c/code\u003e struct using an unchecked \u003ccode\u003esprintf\u003c/code\u003e call. Names longer than roughly 452 bytes overflow into the immediately following struct fields (\u003ccode\u003etext_buf\u003c/code\u003e, \u003ccode\u003etext_ptr\u003c/code\u003e, \u003ccode\u003eterm_spec\u003c/code\u003e, \u003ccode\u003eterm_spec_size\u003c/code\u003e, \u003ccode\u003eterm_spec_index\u003c/code\u003e), overwriting live pointers and counters with attacker-chosen bytes. Subsequent scanner code writes and frees through the corrupted pointers, producing arbitrary write and arbitrary free primitives inside the BEAM VM process, which can be leveraged for remote code execution. On builds compiled with \u003ccode\u003e_FORTIFY_SOURCE\u003c/code\u003e the overflow is detected at runtime and terminates the process with \u003ccode\u003eSIGABRT\u003c/code\u003e, resulting in denial of service.\u003c/p\u003e\n\u003cp\u003eThe overflow occurs in the flex scanner before any grammar or Megaco-level authentication processing, so exploitation requires only network reachability to the megaco transport port on a node configured with \u003ccode\u003e{scanner, flex}\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eThis vulnerability is associated with program files \u003ccode\u003elib/megaco/src/flex/megaco_flex_scanner_drv.flex.src\u003c/code\u003e and program routines \u003ccode\u003emfs_load_property_groups\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eThis issue affects OTP from OTP\u0026nbsp;17.0 before OTP\u0026nbsp;27.3.4.15, from OTP\u0026nbsp;28.0 before OTP\u0026nbsp;28.5.0.4, and from OTP\u0026nbsp;29.0 before OTP\u0026nbsp;29.0.4, corresponding to megaco from 3.17.1 before 4.7.2.2, from 4.8 before 4.8.3.1, and from 4.9 before 4.9.1. Whether OTP before OTP\u0026nbsp;17.0, corresponding to megaco before 3.17.1, is affected is unknown.\u003c/p\u003e"
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"value": "Classic buffer overflow in the Erlang/OTP megaco flex scanner C driver allows a remote unauthenticated attacker to corrupt the driver\u0027s memory (and potentially achieve remote code execution or a denial-of-service crash) by sending a single text-encoded H.248/Megaco message containing an oversized property parm name.\n\nWhen tokenizing a Local/Remote descriptor, `mfs_load_property_groups` extracts the attacker-controlled property name (bounded only by the message length) and, when no value follows, formats it into a fixed 512-byte `error_msg` field of the `MfsErlDrvData` struct using an unchecked `sprintf` call. Names longer than roughly 452 bytes overflow into the immediately following struct fields (`text_buf`, `text_ptr`, `term_spec`, `term_spec_size`, `term_spec_index`), overwriting live pointers and counters with attacker-chosen bytes. Subsequent scanner code writes and frees through the corrupted pointers, producing arbitrary write and arbitrary free primitives inside the BEAM VM process, which can be leveraged for remote code execution. On builds compiled with `_FORTIFY_SOURCE` the overflow is detected at runtime and terminates the process with `SIGABRT`, resulting in denial of service.\n\nThe overflow occurs in the flex scanner before any grammar or Megaco-level authentication processing, so exploitation requires only network reachability to the megaco transport port on a node configured with `{scanner, flex}`.\n\nThis vulnerability is associated with program files `lib/megaco/src/flex/megaco_flex_scanner_drv.flex.src` and program routines `mfs_load_property_groups`.\n\nThis issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, from OTP\u00a028.0 before OTP\u00a028.5.0.4, and from OTP\u00a029.0 before OTP\u00a029.0.4, corresponding to megaco from 3.17.1 before 4.7.2.2, from 4.8 before 4.8.3.1, and from 4.9 before 4.9.1. Whether OTP before OTP\u00a017.0, corresponding to megaco before 3.17.1, is affected is unknown."
}
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},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-120",
"description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787 Out-of-bounds Write",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-08T01:07:34.932Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/erlang/otp/security/advisories/GHSA-7xgh-gmgf-q2g7"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-59250.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-59250"
},
{
"tags": [
"x_version-scheme"
],
"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
},
{
"tags": [
"patch"
],
"url": "https://github.com/erlang/otp/commit/8704c8f550a11ed5f825e3c011ecb03565b79c4f"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Megaco flex scanner buffer overflow via oversized property parm name",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eSwitch the megaco text codec to the default Erlang-based scanner by removing \u003ccode\u003e{scanner, flex}\u003c/code\u003e from the encoder configuration. The Erlang scanner is not affected by this C-level memory corruption, at the cost of reduced parsing throughput.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Switch the megaco text codec to the default Erlang-based scanner by removing `{scanner, flex}` from the encoder configuration. The Erlang scanner is not affected by this C-level memory corruption, at the cost of reduced parsing throughput."
}
],
"value": "Switch the megaco text codec to the default Erlang-based scanner by removing {scanner, flex} from the encoder configuration. The Erlang scanner is not affected by this C-level memory corruption, at the cost of reduced parsing throughput."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-59250",
"datePublished": "2026-07-27T15:25:03.106Z",
"dateReserved": "2026-07-04T04:24:03.653Z",
"dateUpdated": "2026-09-08T01:07:34.932Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.