CVE-2026-95105
Cloak AES-CTR cipher lacks ciphertext authentication, allowing chosen-plaintext forgery by bit flipping
- State
- Published
- Severity
- 8.2 High
- Published
- Oct 6, 2026
- Updated
- Oct 6, 2026
- Reserved
- Sep 25, 2026
Description
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.
Cloak.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.
This issue affects cloak: from 0.1.0-pre onward.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | 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 | EEF |
Weaknesses
- CWE-649 Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking
Affected Products
| Product | Versions |
|---|---|
cloakdanielberkompas |
|
cloakdanielberkompas |
|
References
- EEF CNA record for CVE-2026-95105relatedthird-party-advisory
- OSV record EEF-CVE-2026-95105related
- Introducing commit 2bd1701 in danielberkompas/cloakrelated
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