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CVE-2026-92823— Libmodulemd: libmodulemd: missing decompressed-size limit when parsing compressed yaml

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 libmodulemd 中发现了一个安全漏洞。在启用 rpmio 支持的构建版本中，压缩的 modulemd YAML 文件会通过一个自定义的读取处理器进行解压，但该处理器在解析之前未强制执行累积解压大小限制。攻击者若能提供高度可压缩的压缩 YAML 文件，即可导致系统过度消耗 CPU 和内存资源，从而引发拒绝服务（DoS）攻击。

CVSS 6.2 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-92823

Vulnerability Information
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Vulnerability Title
Libmodulemd: libmodulemd: missing decompressed-size limit when parsing compressed yaml
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libmodulemd. In builds with rpmio support enabled, compressed modulemd YAML is decompressed through a custom read handler that does not enforce a cumulative decompressed-size limit before parsing. An attacker who can supply a highly compressible compressed YAML file can cause excessive CPU and memory consumption, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-92823

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III. Intelligence Information for CVE-2026-92823

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Other References for CVE-2026-92823 (2)

Same Patch Batch · Red Hat · 2026-10-21 · 4 CVEs total

CVE-2026-92824 6.2 MEDIUM Libmodulemd: libmodulemd: out-of-bounds read when emitting rpm-map artifacts
CVE-2026-92822 6.2 MEDIUM Libmodulemd: libmodulemd: unbounded recursion when parsing nested xmd yaml
CVE-2026-114038 5.1 MEDIUM Device-mapper-multipath: device-mapper-multipath: information disclosure via malformed for

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-409

V. Comments for CVE-2026-92823

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