CVE-2026-23940Network attack vector

Application-instance crash via in-memory tarball extraction

Published Mar 13, 2026 · Updated Mar 13, 2026

Uncontrolled resource consumption in Hex.pm before 2026-03-10 allows remote authenticated users to crash an application instance. The package-publishing request path buffers the uploaded body and unpacks its tarball in memory, allowing oversized or concurrent uploads to exhaust available memory. A package publisher must submit a sufficiently large archive or concurrent large publishes; the resulting failure interrupts publishing and possibly other processing on that instance.

CVSS severity7.1
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Hex.pm before 2026-03-10 allows remote authenticated users to crash an application instance. The package-publishing request path buffers the uploaded body and unpacks its tarball in memory, allowing oversized or concurrent uploads to exhaust available memory. A package publisher must submit a sufficiently large archive or concurrent large publishes; the resulting failure interrupts publishing and possibly other processing on that instance.

The record

CVE
CVE-2026-23940
Published
Mar 13, 2026
Updated
Mar 13, 2026
Vendor
Six Colors AB
Product
Hex.pm
Classifications
CWE-400, CAPEC-130, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026-03-10
  2. Affected versionversion=0 <495f01607d3eae4aed7ad09b2f54f31ec7a7df01
  3. Affected versionversion=pkg:github/hexpm/hexpm@0 <pkg:github/hexpm/hexpm@495f01607d3eae4aed7ad09b2f54f31ec7a7df01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Six Colors AB · Hex.pmversion=0 <2026-03-10; version=0 <495f01607d3eae4aed7ad09b2f54f31ec7a7df01; version=pkg:github/hexpm/hexpm@0 <pkg:github/hexpm/hexpm@495f01607d3eae4aed7ad09b2f54f31ec7a7df01

Published CVSS scores

7.1Erlang Ecosystem FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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