{"id":"DEBIAN-CVE-2026-39373","details":"JWCrypto implements JWK, JWS, and JWE specifications using python-cryptography. Prior to 1.5.7, an unauthenticated attacker can exhaust server memory by sending crafted JWE tokens with ZIP compression. The existing patch for CVE-2024-28102  limits input token size to 250KB but does not validate the decompressed output size. An unauthenticated attacker can cause memory exhaustion on memory-constrained systems. A token under the 250KB input limit can decompress to approximately 100MB. This vulnerability is fixed in 1.5.7.","modified":"2026-09-29T13:03:52.991491277Z","published":"2026-04-07T20:16:32.133Z","upstream":["CVE-2026-39373"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-39373"}],"affected":[{"package":{"name":"python-jwcrypto","ecosystem":"Debian:12","purl":"pkg:deb/debian/python-jwcrypto?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.0-1","1.1.0-1+deb12u1","1.5.4-1","1.5.6-1","1.5.6-1.1","1.5.6-1.1~deb13u1","1.5.6-1.2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39373.json"}},{"package":{"name":"python-jwcrypto","ecosystem":"Debian:13","purl":"pkg:deb/debian/python-jwcrypto?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-1.1~deb13u1"}]}],"versions":["1.5.6-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39373.json"}},{"package":{"name":"python-jwcrypto","ecosystem":"Debian:14","purl":"pkg:deb/debian/python-jwcrypto?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.6-1.1"}]}],"versions":["1.5.6-1","1.5.6-1.1~deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39373.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}