Thermal creep is the slow, permanent deformation of a material when heat and mechanical stress act together. In practice, a part may look stable at first, then gradually change shape as it stays warm under load. The effect is common in plastics, adhesives, foams, and other materials used in housings, mounts, and seals.
In cyber security, thermal creep matters because it can weaken physical protections over time. A warm device enclosure can loosen, cable strain relief can fail, or a sensor mount can drift, creating gaps for tampering, probing, or environmental damage. Attackers may use heat to speed up wear in poorly designed hardware, while defenders account for it with material choice, heat testing, and design margins that keep locks, seals, and embedded components reliable across operating temperatures.