CVE-2026-59250
published 2026-07-27CVE-2026-59250: 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…
PriorityP259high8.3CVSS 4.0
AVNACLATPPRNUINVCNVILVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.78%
55.5th percentile
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.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| erlang | otp | >= 17.0 < 27.3.4.15 | 27.3.4.15 |
| erlang | otp | >= 28.0 < 28.5.0.4 | 28.5.0.4 |
| erlang | otp | >= 29.0 < 29.0.4 | 29.0.4 |
| erlang | otp | >= 3.17.1 < 4.7.2.2 | 4.7.2.2 |
| erlang | otp | >= 4.8 < 4.8.3.1 | 4.8.3.1 |
| erlang | otp | >= 4.9 < 4.9.1 | 4.9.1 |
| erlang | otp | >= 84adefa331c4159d432d22840663c38f155cd4c1 < 8704c8f550a11ed5f825e3c011ecb03565b79c4f | 8704c8f550a11ed5f825e3c011ecb03565b79c4f |
| ubuntu | erlang | — | — |
CVSS provenance
nvdv4.08.3HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat8.3HIGH
vendor_oracle8.1HIGH
vendor_ubuntu7.5HIGH
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Ubuntu
Erlang vulnerabilities
vendor_ubuntu·2026-09-28·CVSS 7.5
CVE-2026-23941 [HIGH] Erlang vulnerabilities
Title: Erlang vulnerabilities
Summary: Several security issues were fixed in Erlang.
It was discovered that the Erlang Port Mapper Daemon did not properly
handle slow connections. A remote attacker could possibly use this issue
to cause a denial of service. (CVE-2026-42792)
It was discovered that Erlang incorrectly handled certain external term
format data, leading to heap corruption. An attacker could possibly use
this issue to cause Erlang to crash, resulting in a denial of service.
This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.
(CVE-2026-55737)
It was discovered that Erlang incorrectly handled invalid external term
format data. An attacker could possibly use this issue to cause Erlang to
crash, resulting in a denial of service. This issue only affected Ubuntu
26.04
Red Hat
megaco: Erlang/OTP Megaco Flex Scanner: Remote code execution or denial of service via oversized message
vendor_redhat·2026-07-27·CVSS 8.3
CVE-2026-59250 [HIGH] CWE-120 megaco: Erlang/OTP Megaco Flex Scanner: Remote code execution or denial of service via oversized message
megaco: Erlang/OTP Megaco Flex Scanner: Remote code execution or denial of service via oversized message
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 fie
Oracle
Oracle Oracle GoldenGate Risk Matrix: Java Delivery (JDBC Driver for SQL Server) — CVE-2025-59250
vendor_oracle·2026-01-15·CVSS 8.1
CVE-2025-59250 [HIGH] Oracle Oracle GoldenGate Risk Matrix: Java Delivery (JDBC Driver for SQL Server) — CVE-2025-59250
Oracle Oracle GoldenGate Risk Matrix: Java Delivery (JDBC Driver for SQL Server) vulnerability
CVE: CVE-2025-59250
CVSS: 8.1
Protocol: Multiple
Remote exploit: Yes
Affected versions: Network
Advisory: cpujan2026 (JAN 2026)
No detection rules found.
No public exploits indexed.
https://cna.erlef.org/cves/CVE-2026-59250.htmlhttps://github.com/erlang/otp/commit/8704c8f550a11ed5f825e3c011ecb03565b79c4fhttps://github.com/erlang/otp/security/advisories/GHSA-7xgh-gmgf-q2g7https://osv.dev/vulnerability/EEF-CVE-2026-59250https://www.erlang.org/doc/system/versions.html#order-of-versions
2026-07-27
Published