A vulnerability has been found in GNU Bison up to 3.8.2. This impacts the function code_free of the file src/scan-code.c. The manipulation leads to double free. An attack has to be approached locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. The issue could not be reproduced from a GNU Bison 3.8.2 tarball run in a Fedora 42 container.

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Local

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Gnu
  • Bison

No data.

No data.

References
Link Providers
https://drive.google.com/file/d/123Qe44FaC-GP88dWNl9-6H4jLWUcXYNZ/view?usp=drive_link cve-icon cve-icon cve-icon
https://github.com/akimd/bison/issues/115 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-8734 cve-icon
https://vuldb.com/?ctiid.319230 cve-icon cve-icon cve-icon
https://vuldb.com/?id.319230 cve-icon cve-icon cve-icon
https://vuldb.com/?submit.622300 cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-8734 cve-icon
https://www.gnu.org/ cve-icon cve-icon cve-icon
History

Tue, 19 Aug 2025 04:45:00 +0000

Type Values Removed Values Added
Description A vulnerability classified as problematic has been found in GNU Bison up to 3.8.2. Affected is the function code_free of the file src/scan-code.c. The manipulation leads to double free. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used. A vulnerability has been found in GNU Bison up to 3.8.2. This impacts the function code_free of the file src/scan-code.c. The manipulation leads to double free. An attack has to be approached locally. The exploit has been disclosed to the public and may be used. The actual existence of this vulnerability is currently in question. The issue could not be reproduced from a GNU Bison 3.8.2 tarball run in a Fedora 42 container.

Tue, 12 Aug 2025 08:00:00 +0000

Type Values Removed Values Added
First Time appeared Gnu
Gnu bison
Vendors & Products Gnu
Gnu bison

Tue, 12 Aug 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Low

Fri, 08 Aug 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 08 Aug 2025 18:15:00 +0000

Type Values Removed Values Added
Description A vulnerability classified as problematic has been found in GNU Bison up to 3.8.2. Affected is the function code_free of the file src/scan-code.c. The manipulation leads to double free. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used.
Title GNU Bison scan-code.c code_free double free
Weaknesses CWE-119
CWE-415
References
Metrics cvssV2_0

{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 3.3, 'vector': 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2025-08-08T18:02:07.827Z

Updated: 2025-08-19T04:27:39.163Z

Reserved: 2025-08-08T07:57:09.262Z

Link: CVE-2025-8734

cve-icon Vulnrichment

Updated: 2025-08-08T18:14:16.839Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-08-08T18:15:29.527

Modified: 2025-08-19T05:15:31.280

Link: CVE-2025-8734

cve-icon Redhat

Severity : Low

Publid Date: 2025-08-08T18:02:07Z

Links: CVE-2025-8734 - Bugzilla