CVE-2026-121994High· 8.8▾ TwilightA stack buffer overflow in the GDB client's remote protocol handler allows an attacker-controlled debug target to execute arbitrary code in the GDB process. The vulnerability exists in fetch_register_using_p, which decodes a stub's regis…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
A stack buffer overflow in the GDB client's remote protocol handler allows an attacker-controlled debug target to execute arbitrary code in the GDB process. The vulnerability exists in fetch_register_using_p, which decodes a stub's register reply into an alloca-sized buffer without bounding writes by the register width.
crashgdb (all versions)gdb (all versions)gdb (all versions)crashgcc-toolset-14-gdb (all versions)gcc-toolset-15-gdb (all versions)gdb (all versions)crashgdb (all versions)gdb (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
There is no mitigation for this vulnerability. Users should only connect GDB to trusted debug targets.
Connected by shared product, vendor, weakness, or advisory.
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