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CVE-2026-115449— Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest

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 中发现了一个漏洞。在处理 ICMP 回显请求（ICMP echo request）时，回复报文的长度未根据从主机实际接收到的数据进行更新。在正常 ICMP 套接字不可用的特定条件下，这种长度不匹配会导致主机的真实 IP 地址在回显应答（echo reply）中泄露给客户机，从而破坏了用户态网络本应提供的 NAT 隔离机制。

CVSS 3.5 · Low

Possible ATT&CK Techniques 1 AI

T1046 · Network Service Discovery
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I. Basic Information for CVE-2026-115449

Vulnerability Information
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Vulnerability Title
Libslirp: libslirp: icmp echo reply length desynchronization leaks host ip to guest
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libslirp. When handling ICMP echo requests, the reply length is not updated to match the actual data received from the host. Under specific conditions where the normal ICMP socket is unavailable, this length mismatch causes the host's real IP address to be leaked to the guest in the echo reply, breaking the NAT isolation that user-mode networking is expected to provide.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
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

II. Public POCs for CVE-2026-115449

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III. Intelligence Information for CVE-2026-115449

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Vendor Advisories for CVE-2026-115449 (1)

Other References for CVE-2026-115449 (1)

Same Patch Batch · Red Hat · 2026-10-22 · 5 CVEs total

CVE-2026-111079 7.4 HIGH Goose: goose: shell history and environment leak via terminal integration
CVE-2026-115424 5.5 MEDIUM Oc: oc: symlink/hardlink target validation bypass in oc image extract allows file write ou
CVE-2026-115207 5.5 MEDIUM Patch: filename validation bypass in reversal fallback allows file creation outside the wo
CVE-2026-115221 5.4 MEDIUM Ipa: freeipa: freeipa uses subject cn as proof of certificate ownership

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-200

V. Comments for CVE-2026-115449

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