CVE-2026-49754Public exploitNetwork attack vector

Client crash via unbounded HTTP/2 header accumulation

Published Jun 2, 2026 · Updated Jun 2, 2026

Resource exhaustion in Elixir Mint 0.1.0 through 1.8.0 allows remote attackers controlling an HTTP/2 server to crash the client process. Mint.HTTP2 handle_headers/3 parks incomplete header fragments in conn.headers_being_processed, and handle_continuation/3 appends later fragments without a size or frame-count limit. One connection to a malicious or compromised HTTP/2 server is sufficient; memory grows until the BEAM process terminates, with no reported confidentiality or integrity impact.

CVSS severity8.2
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Elixir Mint 0.1.0 through 1.8.0 allows remote attackers controlling an HTTP/2 server to crash the client process. Mint.HTTP2 handle_headers/3 parks incomplete header fragments in conn.headers_being_processed, and handle_continuation/3 appends later fragments without a size or frame-count limit. One connection to a malicious or compromised HTTP/2 server is sufficient; memory grows until the BEAM process terminates, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2026-49754
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Elixir Mint
Product
Mint
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0.1.0 <1.9.0
  2. Affected versionversion=596ca4304504be68939c4929e0831557097962b8 <b662d127d3028b5426c88d4c9cc7fe430491a10b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Elixir Mint · Mintversion=0.1.0 <1.9.0; version=596ca4304504be68939c4929e0831557097962b8 <b662d127d3028b5426c88d4c9cc7fe430491a10b

Published CVSS scores

8.2Erlang Ecosystem FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

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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