Hi Josip!

On Sat, Oct 31, 2026 at 10:15:05PM +0100, Josip Stjepanovi?? wrote:
> Hello everyone,
> 
> Looking at HAProxys 3.4.7 source code a security vulnerability with CVSS
> score 7.4 was found:
> CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N = 7.4 (High)
> 
> Rationale:
> - AV:Network ??? exploitable over HTTP
> - AC:High ??? attacker must know/guess the pubkey file path (not directly
> observable, but often predictable)
> - PR:None ??? no authentication needed to send the forged token
> - UI:None ??? no user interaction required
> - S:Unchanged ??? stays within HAProxy's authorization scope
> - C:High / I:High ??? full authentication bypass, arbitrary claim forgery
> - A:None ??? no availability impact
> 
> Do I open an Issue on github or do I send the PoC with findings to someone
> directly?
> Kind regards

Please send the report to [email protected].

Thank you!

Olivier


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