CVE-2026-123792— Symfony YAML 解析器拒绝服务漏洞
一分钟漏洞结论
影响对象
sensiolabs symfony
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Symfony Yaml 组件中的 和 模块在解析某些 YAML 文档时效率低下，导致一个精心构造的小型文档需要耗费不成比例的时间进行处理。这会使 PHP 进程持续繁忙数秒甚至数分钟，从而在以下版本的 Symfony 中引发拒绝服务（DoS）风险： 5.4 系列：5.4.56 之前的版本 6.x 系列：6.4.50 之前的版本 7.x 系列：7.4.23 之前的版本 8.x 系列：8.1.11 之前的版本 该解析器在多个位置重复执行已完成的计算工作。具体表现为： 1. 指数级时间增长：流序列（flow sequen
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application
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一、 漏洞 CVE-2026-123792 基础信息
漏洞信息
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Vulnerability Title
Symfony: Exponential and Quadratic Parse Times in the YAML Parser Let a Single Document Hold a Process
来源: CVE Program / CVE List V5
Vulnerability Description
The Symfony Yaml components Inline and Parser, parse some YAML documents inefficiently, so that a small crafted document can take disproportionately long to process, keeping a PHP process busy for seconds or minutes, potentially causing a denial of service in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11.
The parser repeats work it has already done in several places. An embedded mapping in a flow sequence is parsed again for every scalar appended to it, and so are the collections nested in it, so the parse time grows exponentially with the nesting depth. The patterns matching mapping keys and tags scan a run of spaces once per character of the run, and each scalar of a flow collection is matched against a copy of the rest of the collection, so the parse time grows quadratically with the size of the input. Nested blocks are also copied at each nesting level, which consumes memory as well as time. A few other constructs, such as an empty sequence item followed by a blank line or an anchor named 0, trigger similar repeated work.
Any code parsing untrusted YAML is affected, with the default flags. In Symfony 7.4 and later, that includes #[MapRequestPayload] when the Yaml component is installed and the endpoint does not restrict acceptFormat. A single unauthenticated request with a YAML content type keeps a PHP worker busy until max_execution_time. JSON documents are valid YAML, so a JSON payload sent with a YAML content type is enough for the flow collection case. In Symfony 6.4, #[MapRequestPayload] accepts YAML only when the application registers a yaml request format.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| sensiolabs | symfony | 0 ~ 5.4.56 | - |
|
二、漏洞 CVE-2026-123792 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-123792 其他参考 (4)
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https://github.com/symfony/symfony/security/advisories/GHSA-hwfg-qwvh-2wfx third-party-advisory
同批安全公告 · sensiolabs · 2026-11-06 · 共 6 条
| CVE-2026-118515 | 8.4 HIGH | Symfony 任意文件上传漏洞 |
| CVE-2026-121623 | 8.2 HIGH | Symfony DataUriNormalizer 任意文件读取漏洞 |
| CVE-2026-122053 | 6.9 MEDIUM | Symfony ObjectNormalizer 忽略属性路径遍历漏洞 |
| CVE-2026-123746 | 2.3 LOW | Symfony 认证绕过漏洞 |
| CVE-2026-123339 | 2.3 LOW | Symfony 4.4.40 远程请求伪造漏洞 |