NVD security advisoryHigh
High advisory for A flaw was found in libslirp in icmp_for
CVE-2026-120830 · Reported 3 Nov 2026
Full advisory details, affected packages, severity context, and original source.
Affected technology
A flaw was found in libslirp in icmp_forAffected product
Advisory overview
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.