Junrar CVE-2026-97370: One Jump Instruction Hangs RAR Extraction, and Tika Bundled It
A RAR4 archive under 100 bytes can pin a Junrar extraction thread forever: an out-of-range jump in the RAR VM skips both the jump and the operation budget. Fixed in 7.6.1 on 21 July, published as CVE-2026-97370 on 15 October. How the loop and fix work, which Apache Tika releases bundle an affected Junrar, three repository-only advisories scanners miss, and a build checker.