C23/100
Vulnerability · high
Password bypass on Alpine Linux through 257-character input
Tier C · Keep an eye on it – Check if you’re affected
Who’s exposed: Alpine Linux systems with affected OpenSSH password authentication
Tier C because: Hits tech teams
Reach
Attack
Damage
Fix
Core infrastructure · Popular tool
The Brief
- A password bypass affects Alpine Linux and is triggered by a 257-character input.
- Researcher Özgün Kültekin reported the bug to the OpenSSH project on November 4, 2026.
- The article says two design decisions made four years apart in two different projects combined to create the bug.
Why it matters
Developers running OpenSSH on Alpine Linux may be exposed to a password bypass, and the article argues similar bugs may exist in other codebases.
The checklist behind the tier
Checklist · 3 of 10 yes
| Yes | Hits tech teams | Judgment: Alpine Linux is an OS that developers and ops teams run and manage. |
| Yes | Core infrastructure | Judgment: the bug was reported to the OpenSSH project, which nearly every team runs. |
| Yes | Popular tool | Judgment: OpenSSH is widely used, and coreInfra is yes. |
| No | Exploited in the wild | DEV Community: only describes a reported bug; no observed attacks mentioned. |
| No | Public exploit | DEV Community: describes the bug and a 257-character input; no published exploit code mentioned. |
| No | Remote, no login | DEV Community: says 'Type 257 Characters of Anything. You're In.' but does not state network or unauthenticated access. |
| No | Full takeover | DEV Community: reports a password bypass; does not mention code execution, root or admin access. |
| No | Secrets exposed | DEV Community: no mention of stolen credentials, keys, configs, source code or user data. |
| No | Supply chain | DEV Community: describes a bug report, not compromised packages, updates or build pipelines. |
| No | No fix yet | DEV Community: the snippet does not say whether a patched version is available. |
Timeline
Researcher Özgün Kültekin reports the bug to the OpenSSH project
DEV Community: backend
Type 257 Characters of Anything. You're In.
Source
Type 257 Characters of Anything. You're In. ↗ DEV Community: backend · 4h ago
First seen · 1 source · Full story page · How tiers are decided