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CVE-2026-120830— Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosure

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 libslirp 的 函数中发现了一个漏洞。在构建 ICMP 错误响应时，引用的原始 IPv4 数据包长度直接从 IP 头部读取，而未将其限制（clamp）在实际缓冲区长度范围内。截断或畸形数据包可能导致堆越界读取，从而将主机内存泄露到返回给客户机或容器的 ICMP 错误数据包中。

CVSS 7.4 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-120830

Vulnerability Information
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Vulnerability Title
Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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 OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
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
Red Hat Red Hat OpenShift Container Platform 5 - cpe:/a:redhat:openshift:5

II. Public POCs for CVE-2026-120830

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-120830

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Other References for CVE-2026-120830 (3)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125