CVE-2026-48862Public exploitNetwork attack vector

Client process crash via unbounded promised streams

Published Jun 2, 2026 · Updated Jun 2, 2026

Resource exhaustion in Elixir Mint before 1.9.0 allows remote attackers controlling an HTTP/2 server to crash a client process. Mint.HTTP2.decode_push_promise_headers_and_add_response/5 adds every promised stream to conn.streams without applying max_concurrent_streams, while the cap is deferred until response HEADERS arrive. HTTP/2 server push is enabled by default, so one long-lived connection to a hostile server can retain an unbounded reserved_remote entry per withheld HEADERS response until memory is exhausted.

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 before 1.9.0 allows remote attackers controlling an HTTP/2 server to crash a client process. Mint.HTTP2.decode_push_promise_headers_and_add_response/5 adds every promised stream to conn.streams without applying max_concurrent_streams, while the cap is deferred until response HEADERS arrive. HTTP/2 server push is enabled by default, so one long-lived connection to a hostile server can retain an unbounded reserved_remote entry per withheld HEADERS response until memory is exhausted.

The record

CVE
CVE-2026-48862
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Elixir Mint
Product
Mint
Classifications
CWE-770, T1499.004
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=0.2.0 <1.9.0
  2. Affected versionversion=65c6394d05a1b8aa4a7461708c3aa173e8d7a5cf <70b97b6a5209fb288b0e04d8e657dda26c59de67

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Elixir Mint · Mintversion=0.2.0 <1.9.0; version=65c6394d05a1b8aa4a7461708c3aa173e8d7a5cf <70b97b6a5209fb288b0e04d8e657dda26c59de67

Published CVSS scores

8.2EEFCVSS: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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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