Memory Corruption Vulnerability in GNU Bison Up to 3.8.2
CVE-2025-8734

4.8MEDIUM

Key Information:

Vendor

Gnu
Status
Bison
Vendor
CVE Published:
8 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8734?

A significant memory corruption vulnerability has been identified in GNU Bison versions up to 3.8.2. This issue arises from a flaw in the 'code_free' function located in the src/scan-code.c file, which allows for double free conditions. The vulnerability can be exploited locally, allowing an attacker to manipulate memory operations, potentially leading to system instability or unauthorized access. This flaw is publicly disclosed and requires immediate attention to mitigate risks associated with possible exploitation.

Affected Version(s)

Bison 3.8.0

Bison 3.8.1

Bison 3.8.2

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-2025-8734 - Proof of Concept

References

https://vuldb.com/?id.319230
vdb-entrytechnical-description
https://vuldb.com/?ctiid.319230
signaturepermissions-required
https://vuldb.com/?submit.622300
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-8734 : Memory Corruption Vulnerability in GNU Bison Up to 3.8.2