CVE-2026-121997High· 8.1▾ TwilightA heap buffer overflow in gdbserver's QTDPsrc packet handler allows an unauthenticated remote attacker to achieve native code execution in the gdbserver process. The vulnerability results from a mismatch between a packet's declared sourc…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · 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 heap buffer overflow in gdbserver's QTDPsrc packet handler allows an unauthenticated remote attacker to achieve native code execution in the gdbserver process. The vulnerability results from a mismatch between a packet's declared source length and the actual data length, causing hex2bin to write beyond the allocated heap buffer.
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. gdbserver has no authentication mechanism; exposure is limited only by network access to the gdbserver port.
Connected by shared product, vendor, weakness, or advisory.
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