CVE-2025-8734

bison: Bison Double Free Vulnerability

Published Aug 8, 2025 CVSS 3.1 · 3.3 Low EPSS n/a KEV · Not listed

Description

** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: Additional analysis indicates that the files referenced in the stack trace do not exist in Bison.

Affected Products

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-24007	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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

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

History

Nov 4, 2025 12:30 AM References updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
References	https://www.openwall.com/lists/oss-security/2025/10/27/12
Metrics	cvssV2_0 `{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P'}` 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X'}`

Nov 4, 2025 12:15 AM Title updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Title	GNU Bison scan-code.c code_free double free	bison: Bison Double Free Vulnerability
Metrics	ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Nov 3, 2025 11:30 PM Description updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description	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.	REJECT DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: Additional analysis indicates that the files referenced in the stack trace do not exist in Bison.
Metrics	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'}` 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_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'}`	cvssV2_0 `{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P'}` 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'}` 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X'}`

Oct 28, 2025 1:30 AM Added references View changes

Type	Values Removed	Values Added
References		https://www.openwall.com/lists/oss-security/2025/10/27/12

Aug 19, 2025 4:45 AM Description updated View changes

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.

Aug 12, 2025 8:00 AM First appearance in the feed. Affected vendors updated View changes

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

Aug 12, 2025 12:15 AM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2025-8734 https://www.cve.org/CVERecord?id=CVE-2025-8734
Metrics	threat_severity `None`	threat_severity `Low`

Aug 8, 2025 7:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Aug 8, 2025 6:15 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

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		https://drive.google.com/file/d/123Qe44FaC-GP88dWNl9-6H4jLWUcXYNZ/view?usp=drive_link https://github.com/akimd/bison/issues/115 https://vuldb.com/?ctiid.319230 https://vuldb.com/?id.319230 https://vuldb.com/?submit.622300 https://www.gnu.org/
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'}`