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Erlang/OTP CVE-2026-59696

| EUVDEUVD-2026-69229 MEDIUM
Improper Validation of Specified Quantity in Input (CWE-1284)
2026-09-01 EEF
Otp Erlang
6.9
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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
vuln.today AI
5.3 MEDIUM

Network-accessible, zero-auth, zero-configuration path to CPU stall; no confidentiality or integrity impact, only per-process availability degradation with unchanged scope.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Metadata Corrected
Sep 01, 2026 - 15:40 vuln.today
tag: Information Disclosure replaced by Denial Of Service
Source Code Evidence Fetched
Sep 01, 2026 - 15:16 vuln.today
Analysis Generated
Sep 01, 2026 - 15:16 vuln.today

DescriptionCVE.org

Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP stdlib allows a remote attacker to degrade availability by supplying a URI whose port component is a very long run of digits.

uri_string:get_port/1 passes the port substring to binary_to_integer/1 with no length bound, catching only error:badarg, so a syntactically valid port of up to roughly 1.26 million digits converts successfully and costs the calling process hundreds of milliseconds of arbitrary-precision arithmetic. The conversion is reached from every authority-parsing path in uri_string:parse/1, including the host, registered-name, and IPv4 and IPv6 forms. parse/1 is the documented interface for parsing URIs, so any application that parses an attacker-supplied URI is exposed without further configuration. The conversion function is documented to accept integers of any size, so bounding the input is the caller's responsibility.

This issue affects OTP from OTP 21.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to stdlib from 3.5 before 6.2.2.5, from 7.0 before 7.3.0.2, and from 8.0 before 8.0.4.

AnalysisAI

Availability degradation in Erlang/OTP stdlib's URI parser allows any remote, unauthenticated attacker to stall an Erlang process for hundreds of milliseconds by supplying a URI whose port field contains an arbitrarily long run of digits. The function uri_string:parse/1 - the documented, standard interface for URI parsing in OTP - routes all authority forms through get_port/1, which calls binary_to_integer/1 with no length bound; a syntactically valid port of approximately 1.26 million digits converts successfully, burning CPU on arbitrary-precision arithmetic without raising an error. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The application must call uri_string:parse/1 (or any OTP function that internally delegates to it) on a URI supplied or influenced by an attacker, with no prior validation of the port component's length. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:L) characterizes a low-complexity, unauthenticated network attack with limited availability impact - per-process CPU stalling rather than a crash or data breach. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Erlang/OTP to one of the patched releases: OTP 27.3.4.17 or later (stdlib 6.2.2.5+), OTP 28.5.0.6 or later (stdlib 7.3.0.2+), or OTP 29.0.6 or later (stdlib 8.0.4+) as confirmed by the vendor advisory at https://github.com/erlang/otp/security/advisories/GHSA-8qw4-2chm-mvj2. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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CVE-2026-59696 vulnerability details – vuln.today
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