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Erlang/OTP inets CVE-2026-71562

| EUVDEUVD-2026-69224 MEDIUM
Improper Validation of Specified Quantity in Input (CWE-1284)
2026-09-01 EEF
Otp Erlang
6.3
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/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
3.7 LOW

AC:H because exploitation requires attacker control of a server the victim client connects to; A:L for degraded-throughput-only impact with no crash or confidentiality/integrity effect.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
3.7 LOW
AV:N/AC:H/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 - 15:17 vuln.today
Analysis Generated
Sep 01, 2026 - 15:17 vuln.today

DescriptionCVE.org

Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP inets httpc allows a malicious or compromised HTTP server to degrade availability by returning a numeric header whose value is a very long run of digits.

httpc_handler.erl converts the server-supplied Content-Length with list_to_integer/1 before comparing it against max_body_size, so the size check cannot protect the conversion, and the option defaults to nolimit in any case. The same unbounded conversion appears in httpc_response:format_response/1 for Content-Length and in httpc_response:get_ms_from_retry_after/1 for Retry-After, which is guarded only by a check that the first character is a digit. A value of up to roughly 1.26 million digits converts successfully and costs the requesting process hundreds of milliseconds of arbitrary-precision arithmetic per response. 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 17.0 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 inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.

AnalysisAI

CPU exhaustion in Erlang/OTP's inets httpc HTTP client allows a malicious or compromised HTTP server to degrade the availability of any OTP process making outbound HTTP calls by returning numeric headers - specifically Content-Length or Retry-After - containing strings of up to approximately 1.26 million digits. Erlang/OTP versions 17.0 through 29.x are affected across three release lines, covering inets 5.10 through 9.7.2. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application uses Erlang/OTP's `inets httpc` module for outbound HTTP requests and that the attacker controls or has compromised at least one HTTP server the client contacts. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.3 with vector AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N accurately represents a narrow, availability-only impact with a specific targeting prerequisite. … 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 OTP 27.3.4.17 or later in the OTP 27 release line, OTP 28.5.0.6 or later in the OTP 28 line, or OTP 29.0.6 or later in the OTP 29 line, corresponding to inets 9.3.2.7, 9.6.2.3, and 9.7.2 respectively; patch commits aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d and e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa are available on GitHub and release availability should be confirmed at https://www.erlang.org/doc/system/versions.html. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Low
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-2026-71562 vulnerability details – vuln.today
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