CNVD-2026-20775

Vulnerability from cnvd - Published: 2026-05-19
VLAI
Title
多款Mozilla产品缓冲区溢出漏洞（CNVD-2026-20775）
Description
Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox（Web浏览器）的一个延长支持版本。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 多款Mozilla产品存在缓冲区溢出漏洞，该漏洞是由于DOM:Core和HTML组件的边界检查不当造成的。攻击者可利用该漏洞导致沙箱逃逸。
Severity
高
Patch Name
多款Mozilla产品缓冲区溢出漏洞（CNVD-2026-20775）的补丁
Patch Description
Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox（Web浏览器）的一个延长支持版本。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 多款Mozilla产品存在缓冲区溢出漏洞，该漏洞是由于DOM:Core和HTML组件的边界检查不当造成的。攻击者可利用该漏洞导致沙箱逃逸。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.mozilla.org/security/advisories/mfsa2026-13/

Reference
https://bugzilla.mozilla.org/show_bug.cgi?id=2016358
Impacted products
Name
['Mozilla Firefox <148', 'Mozilla Firefox ESR <115.33', 'Mozilla Firefox ESR <140.8', 'Mozilla Thunderbird <148', 'Mozilla Thunderbird <140.8']
Show details on source website
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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2026-2778",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2026-2778"
    }
  },
  "description": "Mozilla Firefox\u662f\u4e00\u6b3e\u5f00\u6e90Web\u6d4f\u89c8\u5668\u3002Mozilla Firefox ESR\u662fFirefox\uff08Web\u6d4f\u89c8\u5668\uff09\u7684\u4e00\u4e2a\u5ef6\u957f\u652f\u6301\u7248\u672c\u3002Mozilla Thunderbird\u662f\u4e00\u5957\u4eceMozilla Application Suite\u72ec\u7acb\u51fa\u6765\u7684\u7535\u5b50\u90ae\u4ef6\u5ba2\u6237\u7aef\u8f6f\u4ef6\u3002\n\n\u591a\u6b3eMozilla\u4ea7\u54c1\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u662f\u7531\u4e8eDOM:Core\u548cHTML\u7ec4\u4ef6\u7684\u8fb9\u754c\u68c0\u67e5\u4e0d\u5f53\u9020\u6210\u7684\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u6c99\u7bb1\u9003\u9038\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.mozilla.org/security/advisories/mfsa2026-13/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2026-20775",
  "openTime": "2026-05-19",
  "patchDescription": "Mozilla Firefox\u662f\u4e00\u6b3e\u5f00\u6e90Web\u6d4f\u89c8\u5668\u3002Mozilla Firefox ESR\u662fFirefox\uff08Web\u6d4f\u89c8\u5668\uff09\u7684\u4e00\u4e2a\u5ef6\u957f\u652f\u6301\u7248\u672c\u3002Mozilla Thunderbird\u662f\u4e00\u5957\u4eceMozilla Application Suite\u72ec\u7acb\u51fa\u6765\u7684\u7535\u5b50\u90ae\u4ef6\u5ba2\u6237\u7aef\u8f6f\u4ef6\u3002\r\n\r\n\u591a\u6b3eMozilla\u4ea7\u54c1\u5b58\u5728\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u662f\u7531\u4e8eDOM:Core\u548cHTML\u7ec4\u4ef6\u7684\u8fb9\u754c\u68c0\u67e5\u4e0d\u5f53\u9020\u6210\u7684\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u6c99\u7bb1\u9003\u9038\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": "\u591a\u6b3eMozilla\u4ea7\u54c1\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-20775\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Mozilla Firefox \u003c148",
      "Mozilla Firefox ESR \u003c115.33",
      "Mozilla Firefox ESR \u003c140.8",
      "Mozilla Thunderbird \u003c148",
      "Mozilla Thunderbird \u003c140.8"
    ]
  },
  "referenceLink": "https://bugzilla.mozilla.org/show_bug.cgi?id=2016358",
  "serverity": "\u9ad8",
  "submitTime": "2026-03-11",
  "title": "\u591a\u6b3eMozilla\u4ea7\u54c1\u7f13\u51b2\u533a\u6ea2\u51fa\u6f0f\u6d1e\uff08CNVD-2026-20775\uff09"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.