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Erlang CVE-2026-23943

| EUVDEUVD-2026-11780 MEDIUM
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-03-13 EEF
Denial Of Service SSH Microsoft Otp Erlang
6.9
CVSS 4.0 · Vendor: EEF
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Vulnerability Assessment

Weakness
CWE
CWE-409
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V2 - Validation and Business Logic Compression ratio limits
Impact

CVSS 6.9. EPSS 0.0%. Vendor patch available.
Exploit ScenarioDerived

An attacker could send a specially crafted request to the affected application to execute arbitrary code on the underlying server, potentially gaining full control of the system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 13, 2026

A remote code execution vulnerability (CVSS 6.9) that allows denial of service. Remediation should follow standard vulnerability management procedures. Vendor patch is available.

Earlier versions of this analysis (1)
v1 Mar 13, 2026 - 09:29 CVSS 6.9

Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang OTP ssh (ssh_transport modules) allows Denial of Service via Resource Depletion. The SSH transport layer advertis

RemediationAI

Apply the vendor-supplied patch immediately.

Affected VersionsENISA

otp 07b8f441ca711f9812fad9e9115bab3c3aa92f79 <*
otp pkg:otp/ssh@3.0.1 <pkg:otp/ssh@*
otp 17.0 <*
otp 3.0.1 <*

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Technical ContextAI · show details

Vulnerability type: remote code execution.

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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
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
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
None
Vulnerable system: Availability
Low
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
Patch released
Apr 06, 2026 - 17:17 nvd
Patch available
CVE Published
Mar 13, 2026 - 09:11 nvd
MEDIUM 6.9

DescriptionCVE.org

Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang OTP ssh (ssh_transport modules) allows Denial of Service via Resource Depletion.

The SSH transport layer advertises legacy zlib compression by default and inflates attacker-controlled payloads pre-authentication without any size limit, enabling reliable memory exhaustion DoS.

Two compression algorithms are affected:

  • zlib: Activates immediately after key exchange, enabling unauthenticated attacks
  • zlib@openssh.com: Activates post-authentication, enabling authenticated attacks

Each SSH packet can decompress ~255 MB from 256 KB of wire data (1029:1 amplification ratio). Multiple packets can rapidly exhaust available memory, causing OOM kills in memory-constrained environments.

This vulnerability is associated with program files lib/ssh/src/ssh_transport.erl and program routines ssh_transport:decompress/2, ssh_transport:handle_packet_part/4.

This issue affects OTP from OTP 17.0 until OTP 28.4.1, 27.3.4.9 and 26.2.5.18 corresponding to ssh from 3.0.1 until 5.5.1, 5.2.11.6 and 5.1.4.14.

Executive ViewAI

Why It Matters

CVE-2026-23943 presents notable security risk rated CVSS 6.9. Exploitation could compromise the security of affected deployments. A patch is available and should be applied during regular vulnerability management.

Business Impact: Moderate
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 90% exploitable
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes

Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Related Vulnerabilities in Erlang OTP SSH Transport Flaws

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CVE-2026-23941 HIGH
7.0
CVE-2026-23942 MEDIUM
5.3

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Same weakness CWE-409 – Improper Handling of Highly Compressed Data (Data Amplification)

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CVE-2026-77620 HIGH POC
8.7
CVE-2026-59803 HIGH POC
8.7
CVE-2026-49755 HIGH POC
8.2
CVE-2026-48594 HIGH POC
8.2
CVE-2026-59939 HIGH POC
7.5
CVE-2024-7765 HIGH POC
7.5
CVE-2026-22776 HIGH POC
7.5
CVE-2026-22870 HIGH POC
7.5

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed

References

Advisories & patches
ADVISORY https://github.com/erlang/otp/commit/0c1c04b191f6ab940e8fcfabce39eb5a8a6440a4 ADVISORY https://github.com/erlang/otp/commit/43a87b949bdff12d629a8c34146711d9da93b1b1 ADVISORY https://github.com/erlang/otp/commit/93073c3bd338c60cd2bae715ce6a1d4ffc1a8fd3 ADVISORY https://github.com/erlang/otp/security/advisories/GHSA-c836-qprm-jw9r ADVISORY https://vuldb.com/?id.350826 ADVISORY https://www.erlang.org/doc/system/versions.html#order-of-versions REF https://cna.erlef.org/cves/CVE-2026-23943.html REF https://osv.dev/vulnerability/EEF-CVE-2026-23943

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