CVE-2026-120830

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    CVE-2026-120830

    Published: 3 Nov 2026Last Modified: 6 Nov 2026

    Summary: Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosure

    Details: 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.

    References: https://access.redhat.com/downloads/content/package-browser/, https://access.redhat.com/security/cve/CVE-2026-120830, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120830.json, https://nvd.nist.gov/vuln/detail/CVE-2026-120830, https://bugzilla.redhat.com/show_bug.cgi?id=2565424, https://gitlab.freedesktop.org/slirp/libslirp/-/commit/21b33a6c5588af9f58d15e528fdc1019452708e4

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -21b33a6c5588af9f58d15e528fdc1019452708e4

    Affected versions

    v4.9.6
    v4.9.5
    v4.9.4
    v4.9.3
    v4.9.2
    v4.9.1
    v4.9.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-120830 | CVE-DB