{"id":"CVE-2026-95105","summary":"Cloak AES-CTR cipher lacks ciphertext authentication, allowing chosen-plaintext forgery by bit flipping","details":"Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking vulnerability in danielberkompas cloak allows an attacker with write access to stored ciphertext to make it decrypt to a chosen value via bit flipping.\n\nCloak.Ciphers.AES.CTR encrypts with AES-256 in CTR mode and stores the key tag, the IV and the ciphertext with no MAC. decrypt/2 checks only the key tag and the minimum length before it returns the plaintext, and Cloak.Ciphers.Deprecated.AES.CTR decrypts the legacy format the same way. CTR is a stream cipher, so a value XORed into the stored ciphertext is XORed into the plaintext at the same offset. An attacker who can write to the encrypted store (for example through SQL injection or a compromised replica) and who knows or can guess a stored plaintext can replace it with any value of the same length. The application receives that value with no error.\n\nThis issue affects cloak: from 0.1.0-pre onward.","aliases":["EEF-CVE-2026-95105"],"modified":"2026-10-08T02:52:38.781069484Z","published":"2026-10-06T08:37:56.987Z","database_specific":{"cwe_ids":["CWE-649"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/95xxx/CVE-2026-95105.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.1.0-pre"},{"fixed":"*"},{"introduced":"2bd17019e285b55c5c218cc842537bf9280f24c3"},{"fixed":"*"}]}],"cna_assigner":"EEF"},"references":[{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-95105"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://cna.erlef.org/cves/CVE-2026-95105.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/95xxx/CVE-2026-95105.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95105"},{"type":"FIX","url":"https://github.com/danielberkompas/cloak/commit/2bd17019e285b55c5c218cc842537bf9280f24c3"},{"type":"PACKAGE","url":"https://github.com/danielberkompas/cloak"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/danielberkompas/cloak","events":[{"introduced":"0"},{"fixed":"2bd17019e285b55c5c218cc842537bf9280f24c3"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-95105.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}