CVE-2026-48824Public exploitNetwork attack vector

Unauthenticated memory-exhaustion DoS via unbounded JSON bodies

Published Jul 20, 2026 · Updated Jul 20, 2026

Resource exhaustion in Axllent Mailpit 1.30.0 and earlier allows remote attackers to interrupt service via JSON API requests. The SetReadStatus, DeleteMessages, SetMessageTags, and ReleaseMessage handlers decode attacker-controlled bodies directly into unbounded IDs slices without MaxBytesReader. Default deployments expose these HTTP endpoints without authentication, and repeated requests compound process memory growth until Mailpit or its host interrupts service.

CVSS severity5.3
Medium
EPSS probability0.42%
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 Axllent Mailpit 1.30.0 and earlier allows remote attackers to interrupt service via JSON API requests. The SetReadStatus, DeleteMessages, SetMessageTags, and ReleaseMessage handlers decode attacker-controlled bodies directly into unbounded IDs slices without MaxBytesReader. Default deployments expose these HTTP endpoints without authentication, and repeated requests compound process memory growth until Mailpit or its host interrupts service.

The record

CVE
CVE-2026-48824
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
Axllent
Product
Mailpit
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=< 1.30.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Axllent · Mailpitversion=< 1.30.1

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499Endpoint Denial of Service

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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