🛡️ OESA-2026-2936 — thunderbird

🟡 CVSS 5.0 — Medium ✅ No Known Exploit OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

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.(CVE-2026-57962)

An attacker who can send HTML chat messages (via Matrix or XMPP) can inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1.(CVE-2026-57963)

Affected software

OESA-2026-2936 is recorded against 1 package.

  • thunderbird (fixed in 140.12.1-1.oe2403sp3)

Timeline and source

Published on 9 July 2026 and last revised on 14 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.openeuler.org (Advisory)
nvd.nist.gov (Advisory)
nvd.nist.gov (Advisory)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-07-09
Updated 2026-08-12
Modified 2026-07-14
Fix URL N/A

Affected Packages

Software From version Fixed in
thunderbird 140.12.1-1.oe2403sp3

Similar Threats

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