CVE-2026-95105 Cloak AES-CTR cipher lacks ciphertext authentication, allowing chosen-plaintext forgery by bit flipping
Attackers with write access to stored ciphertext can forge plaintext values via bit flipping due to missing integrity checks in the Cloak AES-CTR implementation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-95105?
CVE-2026-95105 is a high-severity vulnerability in danielberkompas cloak, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-649
Which versions are affected by CVE-2026-95105?
1 open source package ship an affected version, including cloak.
| Package | Affected | Fixed in |
|---|---|---|
cloak Hex | From 0.1.0-pre | None |
How do I fix CVE-2026-95105?
No fix has been published for CVE-2026-95105 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-95105 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-95105 exists.
Sources
Also known as EEF-CVE-2026-95105, GHSA-hxq7-6hm2-6wvg.