{"id":"CVE-2026-39373","summary":"JWCrypto: JWE ZIP decompression bomb","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.","aliases":["GHSA-fjrm-76x2-c4q4"],"modified":"2026-05-18T06:00:06.707589171Z","published":"2026-04-07T19:35:36.071Z","related":["CGA-g384-jwhx-hww5","SUSE-SU-2026:21425-1","openSUSE-SU-2026:10576-1","openSUSE-SU-2026:20644-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39373.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-409"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39373.json"},{"type":"ADVISORY","url":"https://github.com/latchset/jwcrypto/security/advisories/GHSA-fjrm-76x2-c4q4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39373"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/latchset/jwcrypto","events":[{"introduced":"0"},{"fixed":"63a78e75de7753adca47635132546d11789b90b2"}]}],"versions":["v1.5.6","v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.2","v1.4.1","v1.4.0","v1.3.1","v1.3.0","v1.2.0","v1.1.0","v1.0.0.sig","v1.0.0","v0.9.1","v0.9.0","v0.8.0","v0.7.0","v0.6.0","untagged-59ed3e1fb9835e30c994","untagged-23c3bb2e13ea18af9c56","v0.5.0","0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.1","v0.3.0","v0.2.1","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-39373.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}