5.3

CVE-2026-57962: mozilla thunderbird Uncontrolled Resource Consumption

CVSS: 5.3v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-57962DEBIAN-CVE-2026-57962
Published 01-07-2026Last modified 01-07-2026
Open JSON

Vulnerability summary

CVE-2026-57962 is a medium (CVSS 5.3) Uncontrolled Resource Consumption vulnerability in mozilla thunderbird. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 25.9% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.34%
0%100%
Low · +0.12 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 1
MGASA-2026-0243MGASA-2026-0326OPENSUSE-SU-2026:11164-1

Timeline

  1. 01-07-2026
    PublishedVulnerability first disclosed.
  2. 01-07-2026
    Last modifiedVulnerability information updated.

Description

A malicious LDAP server, which a Thunderbird user is configured to query for address-book autocomplete, can stash arbitrarily large amounts of attacker-supplied data into the Thunderbird LDAP client until it crashes due to memory exhaustion. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.34%

Chance of exploitation in the next 30 days

Percentile

26%

Versus all other CVEs

30-day change

+0.12 pp

From 0.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.34%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • thunderbird< 1:140.13.0esr-2~deb12u1 | < 1:140.13.0esr-2~deb13u1 | < 1:140.13.0esr-1
Mozilla1 product
Ubuntu1 product
  • thunderbirdAll versions (No fix recorded)

3 vendors · 3 products

References

7 links