Vulnerability-Lookup

CVE-2026-4371 (GCVE-0-2026-4371)

Vulnerability from cvelistv5 – Published: 2026-03-24 20:27 – Updated: 2026-06-30 03:19

Title

Out of bounds read in IMAP parsing

Summary

A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.

Severity ?

7.4 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE

CWE-126 - Buffer Over-read

Assigner

mozilla

References

URL

Tags

	https://bugzilla.mozilla.org/show_bug.cgi?id=2023493
	https://www.mozilla.org/security/advisories/mfsa2…
	https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

	Vendor	Product	Version
	Mozilla	Thunderbird	Unaffected: 140.9 , ≤ 140.* (rpm) Unaffected: 149 , ≤ * (rpm)

Credits

Rintaro Kobayashi

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-4371

Vulnerability from fkie_nvd - Published: 2026-03-24 21:16 - Updated: 2026-06-30 03:20

Severity ?

7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Summary

References

URL	Tags
security@mozilla.org	https://bugzilla.mozilla.org/show_bug.cgi?id=2023493	Permissions Required
security@mozilla.org	https://www.mozilla.org/security/advisories/mfsa2026-23/	Vendor Advisory
security@mozilla.org	https://www.mozilla.org/security/advisories/mfsa2026-24/	Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:6188
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:6342
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:6917
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8284
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8285
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8286
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8287
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8288
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8289
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8290
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8315
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:8850
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-4371
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2451001
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4371.json

Impacted products

	Vendor	Product	Version
	mozilla	thunderbird	*
	mozilla	thunderbird	*

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
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          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
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              "version": "149",
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            }
          ]
        }
      ],
      "source": "security@mozilla.org"
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          "product": "Red Hat Enterprise Linux AppStream (v. 8)",
          "vendor": "Red Hat"
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          "product": "Red Hat Enterprise Linux AppStream AUS (v. 8.2)",
          "vendor": "Red Hat"
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        {
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          ],
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          "product": "Red Hat Enterprise Linux AppStream AUS (v.8.4)",
          "vendor": "Red Hat"
        },
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          "product": "Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)",
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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
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    },
    {
      "lang": "es",
      "value": "Un servidor de correo malicioso podr\u00eda enviar cadenas malformadas con longitudes negativas, haciendo que el analizador lea memoria fuera del b\u00fafer. Si un servidor de correo o una conexi\u00f3n a un servidor de correo fueran comprometidos, un atacante podr\u00eda hacer que el analizador funcione mal, potencialmente bloqueando Thunderbird o filtrando datos sensibles. Esta vulnerabilidad afecta a Thunderbird \u0026lt; 149 y Thunderbird \u0026lt; 140.9."
    }
  ],
  "id": "CVE-2026-4371",
  "lastModified": "2026-06-30T03:20:32.143",
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/security/cve/CVE-2026-4371"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451001"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4371.json"
    }
  ],
  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-126"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-130"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

CERTFR-2026-AVI-0354

Vulnerability from certfr_avis - Published: 2026-03-25 - Updated: 2026-03-25

De multiples vulnérabilités ont été découvertes dans les produits Mozilla. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une élévation de privilèges et un déni de service à distance.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
Mozilla	Firefox	Firefox versions antérieures à 149
Mozilla	Thunderbird	Thunderbird versions antérieures à 140.9
Mozilla	Thunderbird	Thunderbird versions antérieures à 149
Mozilla	Firefox ESR	Firefox ESR versions antérieures à 140.9
Mozilla	Firefox ESR	Firefox ESR versions antérieures à 115.34

References

Title

Publication Time

GHSA-4P49-PGHR-968W

Vulnerability from github – Published: 2026-03-24 21:31 – Updated: 2026-06-30 03:36

Details

Severity ?

7.4 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-4371"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-126",
      "CWE-130"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-24T21:16:29Z",
    "severity": "HIGH"
  },
  "details": "A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability affects Thunderbird \u003c 149 and Thunderbird \u003c 140.9.",
  "id": "GHSA-4p49-pghr-968w",
  "modified": "2026-06-30T03:36:00Z",
  "published": "2026-03-24T21:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4371"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-24"
    },
    {
      "type": "WEB",
      "url": "https://www.mozilla.org/security/advisories/mfsa2026-23"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4371.json"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451001"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2023493"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-4371"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8850"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8315"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8290"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8289"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8288"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8287"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8286"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8285"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:8284"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:6917"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:6342"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:6188"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CNVD-2026-16381

Vulnerability from cnvd - Published: 2026-04-08

Title

Mozilla Thunderbird信息泄露漏洞（CNVD-2026-16381）

Description

Mozilla Thunderbird是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird存在信息泄露漏洞，攻击者可利用该漏洞获取敏感信息。

Severity

高

Patch Name

Mozilla Thunderbird信息泄露漏洞（CNVD-2026-16381）的补丁

Patch Description

Mozilla Thunderbird是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird存在信息泄露漏洞，攻击者可利用该漏洞获取敏感信息。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://www.thunderbird.net/zh-CN/download/

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=2023493

Impacted products

Name
['Mozilla Thunderbird <149', 'Mozilla Thunderbird <140.9']

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-4371",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-4371"
    }
  },
  "description": "Mozilla Thunderbird\u662f\u7f8e\u56fdMozilla\u57fa\u91d1\u4f1a\u7684\u4e00\u5957\u4eceMozilla Application Suite\u72ec\u7acb\u51fa\u6765\u7684\u7535\u5b50\u90ae\u4ef6\u5ba2\u6237\u7aef\u8f6f\u4ef6\u3002\u8be5\u8f6f\u4ef6\u652f\u6301IMAP\u3001POP\u90ae\u4ef6\u534f\u8bae\u4ee5\u53caHTML\u90ae\u4ef6\u683c\u5f0f\u3002\n\nMozilla Thunderbird\u5b58\u5728\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u53d6\u654f\u611f\u4fe1\u606f\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://www.thunderbird.net/zh-CN/download/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-16381",
  "openTime": "2026-04-08",
  "patchDescription": "Mozilla Thunderbird\u662f\u7f8e\u56fdMozilla\u57fa\u91d1\u4f1a\u7684\u4e00\u5957\u4eceMozilla Application Suite\u72ec\u7acb\u51fa\u6765\u7684\u7535\u5b50\u90ae\u4ef6\u5ba2\u6237\u7aef\u8f6f\u4ef6\u3002\u8be5\u8f6f\u4ef6\u652f\u6301IMAP\u3001POP\u90ae\u4ef6\u534f\u8bae\u4ee5\u53caHTML\u90ae\u4ef6\u683c\u5f0f\u3002\r\n\r\nMozilla Thunderbird\u5b58\u5728\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u53d6\u654f\u611f\u4fe1\u606f\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Mozilla Thunderbird\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2026-16381\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Mozilla Thunderbird \u003c149",
      "Mozilla Thunderbird \u003c140.9"
    ]
  },
  "referenceLink": "https://bugzilla.mozilla.org/show_bug.cgi?id=2023493",
  "serverity": "\u9ad8",
  "submitTime": "2026-03-31",
  "title": "Mozilla Thunderbird\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\uff08CNVD-2026-16381\uff09"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-4371 (GCVE-0-2026-4371)

FKIE_CVE-2026-4371

CERTFR-2026-AVI-0354

Solutions

GHSA-4P49-PGHR-968W

CNVD-2026-16381

Tags

Sightings

Nomenclature