Product
5 published CVES affecting leafnode, from public sources (CVE.org, NVD, CISA KEV, FIRST EPSS, OSV).
Newest publication first
The fetchnews NNTP client in leafnode 1.11.2 and earlier can hang while waiting for input that never arrives, which allows remote NNTP servers to cause a denial of service (news loss).
fetchnews in leafnode 1.9.48 to 1.11.1 allows remote NNTP servers to cause a denial of service (crash) by closing the connection while fetchnews is reading (1) an article header or (2) an article body, which also prevents fetchnews from querying other servers.
fetchnews in leafnode 1.9.47 and earlier allows remote attackers to cause a denial of service (process hang) via an empty NNTP news article with missing mandatory headers.
The fetchnews NNTP client in leafnode 1.9.3 to 1.9.41 allows remote attackers to cause a denial of service (process hang and termination) via certain malformed Usenet news articles that cause fetchnews to hang while waiting for input.
The leafnode server in leafnode 1.9.20 to 1.9.29 allows remote attackers to cause a denial of service (infinite loop) when leafnode requests a cross-posted article to one group whose name is a prefix of another group.
Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.