A vulnerability was found in GNU Bison up to 3.8.2. It has been rated as problematic. This issue affects the function __obstack_vprintf_internal of the file obprintf.c. The manipulation leads to reachable assertion. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.

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

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://github.com/akimd/bison/issues/113 cve-icon cve-icon cve-icon
https://github.com/akimd/bison/issues/114 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-8733 cve-icon
https://vuldb.com/?ctiid.319229 cve-icon cve-icon cve-icon
https://vuldb.com/?id.319229 cve-icon cve-icon cve-icon
https://vuldb.com/?submit.622298 cve-icon cve-icon cve-icon
https://vuldb.com/?submit.622299 cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-8733 cve-icon
https://www.gnu.org/ cve-icon cve-icon cve-icon
History

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 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Fri, 08 Aug 2025 17:45:00 +0000

Type Values Removed Values Added
Description A vulnerability was found in GNU Bison up to 3.8.2. It has been rated as problematic. This issue affects the function __obstack_vprintf_internal of the file obprintf.c. The manipulation leads to reachable assertion. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.
Title GNU Bison obprintf.c __obstack_vprintf_internal assertion
Weaknesses CWE-617
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: 2025-08-08T17:32:06.798Z

Updated: 2025-08-08T17:52:55.136Z

Reserved: 2025-08-08T07:57:05.616Z

Link: CVE-2025-8733

cve-icon Vulnrichment

Updated: 2025-08-08T17:48:27.572Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-08-08T18:15:29.337

Modified: 2025-08-08T20:30:18.180

Link: CVE-2025-8733

cve-icon Redhat

Severity : Low

Publid Date: 2025-08-08T17:32:06Z

Links: CVE-2025-8733 - Bugzilla