Authentication Bypass in Pig Software by Pig-Mesh
CVE-2026-91995

9.3CRITICAL

Key Information:

Vendor

Pig-mesh

Status
Pig
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91995?

An authentication bypass vulnerability exists in Pig software prior to version 4.1.0, specifically within the /register/password endpoint. This issue arises because the system improperly handles password verification, allowing attackers to submit any value as the current password. Consequently, remote attackers can exploit this flaw to overwrite any account's credentials, including administrator accounts, enabling them to gain full control over the compromised accounts.

Affected Version(s)

pig 0 < 4.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-91995 - Proof of Concept

References

https://github.com/geo-chen/oss/blob/main/pig.md
third-party-advisoryexploit
https://github.com/pig-mesh/pig/issues/1249
issue-tracking
https://github.com/pig-mesh/pig/commit/ce958668f399110b97...
patch

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.