CVE-2026-121996High· 8.2▾ TwilightA length validation flaw in gdbserver's agent-expression parser allows an unauthenticated remote attacker to read uninitialized heap memory from the gdbserver process and cause a denial of service. Disclosed heap content includes address…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · 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 length validation flaw in gdbserver's agent-expression parser allows an unauthenticated remote attacker to read uninitialized heap memory from the gdbserver process and cause a denial of service. Disclosed heap content includes addresses suitable for defeating ASLR in further exploitation.
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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