CVE-2026-88355 tinyexpr - Buffer Overflow

tinyexpr contains a buffer overflow caused by incorrect buffer size calculation in new_expr() for arity-0 expression nodes, letting attackers cause undefined behavior and process termination, exploit requires crafted input.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
24 September 2026
Updated
15 October 2026
Weakness
CWE-131

Vendor fix

Update to the latest version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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