CVE-2026-57962Network attack vector

Client crash via unbounded LDAP response buffering

Published Jul 1, 2026 · Updated Jul 1, 2026

Resource exhaustion in Mozilla Thunderbird before 152.0.1 or ESR before 140.12.1 allows remote attackers to crash the client via LDAP. The LDAP address-book client retains arbitrarily large attacker-supplied server data without a size bound, exhausting process memory. Reachability requires an LDAP address book configured for autocomplete and user interaction that triggers a query; the bounded consequence is a Thunderbird client crash.

CVSS severity5.3
Medium
EPSS probability0.22%
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 Mozilla Thunderbird before 152.0.1 or ESR before 140.12.1 allows remote attackers to crash the client via LDAP. The LDAP address-book client retains arbitrarily large attacker-supplied server data without a size bound, exhausting process memory. Reachability requires an LDAP address book configured for autocomplete and user interaction that triggers a query; the bounded consequence is a Thunderbird client crash.

The record

CVE
CVE-2026-57962
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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