Stack buffer overflow in SCTP error cause parsing in inet_drv allows remote VM crash

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Summary

CVECVE-2026-49759
StatePUBLISHED
AssignerEEF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-10 16:17:12 UTC
Updated2026-06-30 03:20:29 UTC
DescriptionStack-based Buffer Overflow vulnerability in Erlang OTP erts (inet_drv) allows an unauthenticated remote attacker to crash the BEAM VM by sending a crafted SCTP ERROR chunk. The sctp_parse_error_chunk function in erts/emulator/drivers/common/inet_drv.c parses SCTP ERROR chunks and writes cause codes into a fixed-size stack-allocated ErlDrvTermData spec[] array without checking bounds. A remote attacker who has established an SCTP association to a listening port can send a single crafted SCTP ERROR chunk containing enough cause codes to overflow the stack buffer, crashing the VM. The attacker can only write 16-bit values interleaved with a fixed tag, so the overflow does not provide a controlled return address, limiting exploitation to Denial of Service. A crafted SCTP ERROR chunk may also leak bits and pieces of Erlang VM memory into the received error packet observed by the Erlang process. Such data is already readable by the user running the Erlang VM, so the disclosure scope is limited. This issue affects OTP from OTP 17.0 before 27.3.4.13, 28.5.0.2 and 29.0.2, corresponding to erts from 6.0 before 15.2.7.9, 16.4.0.2 and 17.0.2.

Risk And Classification

Primary CVSS: v4.0 8.8 HIGH from 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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

EPSS: 0.004660000 probability, percentile 0.365930000 (date 2026-06-16)

Problem Types: CWE-121 | CWE-120 | CWE-121 CWE-121 Stack-based Buffer Overflow | CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

VersionSourceTypeScoreSeverityVector
4.06b3ad84c-e1a6-4bf7-a703-f496b71e49dbSecondary8.8HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS8.8HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Primary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
3.1ADPCVSS8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Erlang Erlang/otp All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Erlang OTP affected 6.0 * otp Not specified
CNA Erlang OTP affected 17.0 * otp Not specified
CNA Erlang OTP affected 84adefa331c4159d432d22840663c38f155cd4c1 3983d495284331c121f600a80bac9fcf4e16381e git Not specified
ADP Red Hat Red Hat OpenStack Platform 16.2 Not specified Not specified
ADP Red Hat Red Hat OpenStack Platform 17.1 Not specified Not specified
ADP Red Hat Red Hat OpenStack Platform 18.0 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/security/cve/CVE-2026-49759 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
github.com/erlang/otp/commit/3983d495284331c121f600a80bac9fcf4e16381e 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com Patch
www.erlang.org/doc/system/versions.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db www.erlang.org Product
osv.dev/vulnerability/EEF-CVE-2026-49759 6b3ad84c-e1a6-4bf7-a703-f496b71e49db osv.dev Third Party Advisory
cna.erlef.org/cves/CVE-2026-49759.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db cna.erlef.org Third Party Advisory
github.com/erlang/otp/security/advisories/GHSA-6f4f-chj5-5g97 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com Vendor Advisory
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-49759.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Zhang Delong (en)

CNA: Raimo Niskanen (en)

Additional Advisory Data

SourceTimeEvent
ADP2026-06-10T16:01:51.030ZReported to Red Hat.
ADP2026-06-10T14:35:38.838ZMade public.
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